Update dependencies

Update to Python 3.7 and latest versions of direct and transitive
dependencies. Fix a deprecation warning related to docutils returning an
iterator for document.traverse in project Sphinx extension.

Pipfile

@@ -15,4 +15,4 @@ sphinxcontrib-seqdiag = "*"
 [dev-packages]
 
 [requires]
-python_version = "3.6"
+python_version = "3.7"

Pipfile.lock

@@ -1,11 +1,11 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "49436bd593c2b93213655f26a631e356f4630a0358f6515516588831ff8ee25f"
+            "sha256": "3151972ce4e2e736671d7064cc3ce751528ee0c4d4c0e45bd6fe21602985ed76"
         },
         "pipfile-spec": 6,
         "requires": {
-            "python_version": "3.6"
+            "python_version": "3.7"
         },
         "sources": [
             {
@@ -25,25 +25,25 @@
         },
         "babel": {
             "hashes": [
-                "sha256:6778d85147d5d85345c14a26aada5e478ab04e39b078b0745ee6870c2b5cf669",
-                "sha256:8cba50f48c529ca3fa18cf81fa9403be176d374ac4d60738b839122dfaaa3d23"
+                "sha256:1aac2ae2d0d8ea368fa90906567f5c08463d98ade155c0c4bfedd6a0f7160e38",
+                "sha256:d670ea0b10f8b723672d3a6abeb87b565b244da220d76b4dba1b66269ec152d4"
             ],
-            "version": "==2.6.0"
+            "version": "==2.8.0"
         },
         "blockdiag": {
             "hashes": [
-                "sha256:8dd6570a2ac41b3c0dfe5706de20913cdbebe1bbd2e6dea9ebc13db79df8c151",
-                "sha256:929125db1cb59145e09dc561021389c7ca71108ef4e4c51a12728eea5b75fccc"
+                "sha256:16a69dd9f3b44c9e0869999ce82aa968586698febc86ece9ca0c902dba772397",
+                "sha256:fa0b47cf25bfc4d546b7fc284c70c3bac875a066e744b4a6b1d9ba457e4ed077"
             ],
-            "version": "==1.5.4"
+            "version": "==2.0.1"
         },
         "certifi": {
             "hashes": [
-                "sha256:339dc09518b07e2fa7eda5450740925974815557727d6bd35d319c1524a04a4c",
-                "sha256:6d58c986d22b038c8c0df30d639f23a3e6d172a05c3583e766f4c0b785c0986a"
+                "sha256:1d987a998c75633c40847cc966fcf5904906c920a7f17ef374f5aa4282abd304",
+                "sha256:51fcb31174be6e6664c5f69e3e1691a2d72a1a12e90f872cbdb1567eb47b6519"
             ],
             "index": "pypi",
-            "version": "==2018.10.15"
+            "version": "==2020.4.5.1"
         },
         "chardet": {
             "hashes": [
@@ -54,11 +54,10 @@
         },
         "docutils": {
             "hashes": [
-                "sha256:02aec4bd92ab067f6ff27a38a38a41173bf01bed8f89157768c1573f53e474a6",
-                "sha256:51e64ef2ebfb29cae1faa133b3710143496eca21c530f3f71424d77687764274",
-                "sha256:7a4bd47eaf6596e1295ecb11361139febe29b084a87bf005bf899f9a42edc3c6"
+                "sha256:0c5b78adfbf7762415433f5515cd5c9e762339e23369dbe8000d84a4bf4ab3af",
+                "sha256:c2de3a60e9e7d07be26b7f2b00ca0309c207e06c100f9cc2a94931fc75a478fc"
             ],
-            "version": "==0.14"
+            "version": "==0.16"
         },
         "funcparserlib": {
             "hashes": [
@@ -66,199 +65,258 @@
             ],
             "version": "==0.3.6"
         },
-        "gitdb2": {
+        "gitdb": {
             "hashes": [
-                "sha256:83361131a1836661a155172932a13c08bda2db3674e4caa32368aa6eb02f38c2",
-                "sha256:e3a0141c5f2a3f635c7209d56c496ebe1ad35da82fe4d3ec4aaa36278d70648a"
+                "sha256:6f0ecd46f99bb4874e5678d628c3a198e2b4ef38daea2756a2bfd8df7dd5c1a5",
+                "sha256:ba1132c0912e8c917aa8aa990bee26315064c7b7f171ceaaac0afeb1dc656c6a"
             ],
-            "version": "==2.0.5"
+            "version": "==4.0.4"
         },
         "gitpython": {
             "hashes": [
-                "sha256:563221e5a44369c6b79172f455584c9ebbb122a13368cc82cb4b5addff788f82",
-                "sha256:8237dc5bfd6f1366abeee5624111b9d6879393d84745a507de0fda86043b65a8"
+                "sha256:6d4f10e2aaad1864bb0f17ec06a2c2831534140e5883c350d58b4e85189dab74",
+                "sha256:71b8dad7409efbdae4930f2b0b646aaeccce292484ffa0bc74f1195582578b3d"
             ],
             "index": "pypi",
-            "version": "==2.1.11"
+            "version": "==3.1.1"
         },
         "idna": {
             "hashes": [
-                "sha256:156a6814fb5ac1fc6850fb002e0852d56c0c8d2531923a51032d1b70760e186e",
-                "sha256:684a38a6f903c1d71d6d5fac066b58d7768af4de2b832e426ec79c30daa94a16"
+                "sha256:7588d1c14ae4c77d74036e8c22ff447b26d0fde8f007354fd48a7814db15b7cb",
+                "sha256:a068a21ceac8a4d63dbfd964670474107f541babbd2250d61922f029858365fa"
             ],
-            "version": "==2.7"
+            "version": "==2.9"
         },
         "imagesize": {
             "hashes": [
-                "sha256:3f349de3eb99145973fefb7dbe38554414e5c30abd0c8e4b970a7c9d09f3a1d8",
-                "sha256:f3832918bc3c66617f92e35f5d70729187676313caa60c187eb0f28b8fe5e3b5"
+                "sha256:6965f19a6a2039c7d48bca7dba2473069ff854c36ae6f19d2cde309d998228a1",
+                "sha256:b1f6b5a4eab1f73479a50fb79fcf729514a900c341d8503d62a62dbc4127a2b1"
             ],
-            "version": "==1.1.0"
+            "version": "==1.2.0"
         },
         "jinja2": {
             "hashes": [
-                "sha256:74c935a1b8bb9a3947c50a54766a969d4846290e1e788ea44c1392163723c3bd",
-                "sha256:f84be1bb0040caca4cea721fcbbbbd61f9be9464ca236387158b0feea01914a4"
+                "sha256:89aab215427ef59c34ad58735269eb58b1a5808103067f7bb9d5836c651b3bb0",
+                "sha256:f0a4641d3cf955324a89c04f3d94663aa4d638abe8f733ecd3582848e1c37035"
             ],
-            "version": "==2.10"
+            "version": "==2.11.2"
         },
         "markupsafe": {
             "hashes": [
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+                "sha256:00bc623926325b26bb9605ae9eae8a215691f33cae5df11ca5424f06f2d1f473",
+                "sha256:09027a7803a62ca78792ad89403b1b7a73a01c8cb65909cd876f7fcebd79b161",
+                "sha256:09c4b7f37d6c648cb13f9230d847adf22f8171b1ccc4d5682398e77f40309235",
+                "sha256:1027c282dad077d0bae18be6794e6b6b8c91d58ed8a8d89a89d59693b9131db5",
+                "sha256:13d3144e1e340870b25e7b10b98d779608c02016d5184cfb9927a9f10c689f42",
+                "sha256:24982cc2533820871eba85ba648cd53d8623687ff11cbb805be4ff7b4c971aff",
+                "sha256:29872e92839765e546828bb7754a68c418d927cd064fd4708fab9fe9c8bb116b",
+                "sha256:43a55c2930bbc139570ac2452adf3d70cdbb3cfe5912c71cdce1c2c6bbd9c5d1",
+                "sha256:46c99d2de99945ec5cb54f23c8cd5689f6d7177305ebff350a58ce5f8de1669e",
+                "sha256:500d4957e52ddc3351cabf489e79c91c17f6e0899158447047588650b5e69183",
+                "sha256:535f6fc4d397c1563d08b88e485c3496cf5784e927af890fb3c3aac7f933ec66",
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+                "sha256:62fe6c95e3ec8a7fad637b7f3d372c15ec1caa01ab47926cfdf7a75b40e0eac1",
+                "sha256:6788b695d50a51edb699cb55e35487e430fa21f1ed838122d722e0ff0ac5ba15",
+                "sha256:6dd73240d2af64df90aa7c4e7481e23825ea70af4b4922f8ede5b9e35f78a3b1",
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+                "sha256:8defac2f2ccd6805ebf65f5eeb132adcf2ab57aa11fdf4c0dd5169a004710e7d",
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+                "sha256:9add70b36c5666a2ed02b43b335fe19002ee5235efd4b8a89bfcf9005bebac0d",
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+                "sha256:ade5e387d2ad0d7ebf59146cc00c8044acbd863725f887353a10df825fc8ae21",
+                "sha256:b00c1de48212e4cc9603895652c5c410df699856a2853135b3967591e4beebc2",
+                "sha256:b1282f8c00509d99fef04d8ba936b156d419be841854fe901d8ae224c59f0be5",
+                "sha256:b2051432115498d3562c084a49bba65d97cf251f5a331c64a12ee7e04dacc51b",
+                "sha256:ba59edeaa2fc6114428f1637ffff42da1e311e29382d81b339c1817d37ec93c6",
+                "sha256:c8716a48d94b06bb3b2524c2b77e055fb313aeb4ea620c8dd03a105574ba704f",
+                "sha256:cd5df75523866410809ca100dc9681e301e3c27567cf498077e8551b6d20e42f",
+                "sha256:cdb132fc825c38e1aeec2c8aa9338310d29d337bebbd7baa06889d09a60a1fa2",
+                "sha256:e249096428b3ae81b08327a63a485ad0878de3fb939049038579ac0ef61e17e7",
+                "sha256:e8313f01ba26fbbe36c7be1966a7b7424942f670f38e666995b88d012765b9be"
             ],
-            "version": "==1.0"
+            "version": "==1.1.1"
         },
         "packaging": {
             "hashes": [
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+                "sha256:82f77b9bee21c1bafbf35a84905d604d5d1223801d639cf3ed140bd651c08752"
             ],
-            "version": "==18.0"
+            "version": "==20.3"
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         "pillow": {
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-            ],
-            "version": "==5.3.0"
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+                "sha256:cd47793f7bc9285a88c2b5551d3f16a2ddd005789614a34c5f4a598c2a162383",
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+                "sha256:da737ab273f4d60ae552f82ad83f7cbd0e173ca30ca20b160f708c92742ee212",
+                "sha256:eb84e7e5b07ff3725ab05977ac56d5eeb0c510795aeb48e8b691491be3c5745b"
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         },
         "pygments": {
             "hashes": [
-                "sha256:78f3f434bcc5d6ee09020f92ba487f95ba50f1e3ef83ae96b9d5ffa1bab25c5d",
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-            "version": "==2.2.0"
+            "version": "==2.6.1"
         },
         "pyparsing": {
             "hashes": [
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-                "sha256:d29593d8ebe7b57d6967b62494f8c72b03ac0262b1eed63826c6f788b3606401"
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             ],
-            "version": "==2.2.2"
+            "version": "==2.4.7"
         },
         "pytz": {
             "hashes": [
-                "sha256:642253af8eae734d1509fc6ac9c1aee5e5b69d76392660889979b9870610a46b",
-                "sha256:91e3ccf2c344ffaa6defba1ce7f38f97026943f675b7703f44789768e4cb0ece"
+                "sha256:1c557d7d0e871de1f5ccd5833f60fb2550652da6be2693c1e02300743d21500d",
+                "sha256:b02c06db6cf09c12dd25137e563b31700d3b80fcc4ad23abb7a315f2789819be"
             ],
-            "version": "==2018.6"
+            "version": "==2019.3"
         },
         "requests": {
             "hashes": [
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-                "sha256:a84b8c9ab6239b578f22d1c21d51b696dcfe004032bb80ea832398d6909d7279"
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             ],
             "index": "pypi",
-            "version": "==2.20.0"
+            "version": "==2.23.0"
         },
         "seqdiag": {
             "hashes": [
-                "sha256:78104e7644c1a4d3a5cacb68de6a7f720793f08dd78561ef0e9e80bed63702bf",
-                "sha256:887cf56b00bd2492e17ef3a16c4270ff263df3c249eddea85844bb61b594785a"
+                "sha256:3167f16b4d15f3cd20de302fa600c96e4a50c92dae873bcbcf136c7588eeaa48",
+                "sha256:93ebc7a0c6b56b6ba0d1e36863c5749f03e82c487b6d1e6f1103b4219323f24c"
             ],
-            "version": "==0.9.6"
+            "version": "==2.0.0"
         },
         "six": {
             "hashes": [
-                "sha256:70e8a77beed4562e7f14fe23a786b54f6296e34344c23bc42f07b15018ff98e9",
-                "sha256:832dc0e10feb1aa2c68dcc57dbb658f1c7e65b9b61af69048abc87a2db00a0eb"
+                "sha256:236bdbdce46e6e6a3d61a337c0f8b763ca1e8717c03b369e87a7ec7ce1319c0a",
+                "sha256:8f3cd2e254d8f793e7f3d6d9df77b92252b52637291d0f0da013c76ea2724b6c"
             ],
-            "version": "==1.11.0"
+            "version": "==1.14.0"
         },
-        "smmap2": {
+        "smmap": {
             "hashes": [
-                "sha256:0555a7bf4df71d1ef4218e4807bbf9b201f910174e6e08af2e138d4e517b4dde",
-                "sha256:29a9ffa0497e7f2be94ca0ed1ca1aa3cd4cf25a1f6b4f5f87f74b46ed91d609a"
+                "sha256:52ea78b3e708d2c2b0cfe93b6fc3fbeec53db913345c26be6ed84c11ed8bebc1",
+                "sha256:b46d3fc69ba5f367df96d91f8271e8ad667a198d5a28e215a6c3d9acd133a911"
             ],
-            "version": "==2.0.5"
+            "version": "==3.0.2"
         },
         "snowballstemmer": {
             "hashes": [
-                "sha256:919f26a68b2c17a7634da993d91339e288964f93c274f1343e3bbbe2096e1128",
-                "sha256:9f3bcd3c401c3e862ec0ebe6d2c069ebc012ce142cce209c098ccb5b09136e89"
+                "sha256:209f257d7533fdb3cb73bdbd24f436239ca3b2fa67d56f6ff88e86be08cc5ef0",
+                "sha256:df3bac3df4c2c01363f3dd2cfa78cce2840a79b9f1c2d2de9ce8d31683992f52"
             ],
-            "version": "==1.2.1"
+            "version": "==2.0.0"
         },
         "sphinx": {
             "hashes": [
-                "sha256:652eb8c566f18823a022bb4b6dbc868d366df332a11a0226b5bc3a798a479f17",
-                "sha256:d222626d8356de702431e813a05c68a35967e3d66c6cd1c2c89539bb179a7464"
+                "sha256:b4c750d546ab6d7e05bdff6ac24db8ae3e8b8253a3569b754e445110a0a12b66",
+                "sha256:fc312670b56cb54920d6cc2ced455a22a547910de10b3142276495ced49231cb"
             ],
             "index": "pypi",
-            "version": "==1.8.1"
+            "version": "==2.4.4"
+        },
+        "sphinxcontrib-applehelp": {
+            "hashes": [
+                "sha256:806111e5e962be97c29ec4c1e7fe277bfd19e9652fb1a4392105b43e01af885a",
+                "sha256:a072735ec80e7675e3f432fcae8610ecf509c5f1869d17e2eecff44389cdbc58"
+            ],
+            "version": "==1.0.2"
         },
         "sphinxcontrib-blockdiag": {
             "hashes": [
-                "sha256:2d2ccde16bafb061ae8d2008f9524726e8ccd2a8502651b76a1e7f07a4ffd8eb",
-                "sha256:7cdff966d8f372b9536374954314a6cf4280e0e48bc2321a4f25cc7f2114f8f0"
+                "sha256:51ce7cff8d25dfd4c8a753d5aa5491e6dbf280004719c49e8001e583ecda7d91",
+                "sha256:91fd35b64f1f25db59d80b8a5196ed4ffadf57a81f63ee207e34d53ec36d8f97"
             ],
             "index": "pypi",
-            "version": "==1.5.5"
+            "version": "==2.0.0"
+        },
+        "sphinxcontrib-devhelp": {
+            "hashes": [
+                "sha256:8165223f9a335cc1af7ffe1ed31d2871f325254c0423bc0c4c7cd1c1e4734a2e",
+                "sha256:ff7f1afa7b9642e7060379360a67e9c41e8f3121f2ce9164266f61b9f4b338e4"
+            ],
+            "version": "==1.0.2"
+        },
+        "sphinxcontrib-htmlhelp": {
+            "hashes": [
+                "sha256:3c0bc24a2c41e340ac37c85ced6dafc879ab485c095b1d65d2461ac2f7cca86f",
+                "sha256:e8f5bb7e31b2dbb25b9cc435c8ab7a79787ebf7f906155729338f3156d93659b"
+            ],
+            "version": "==1.0.3"
+        },
+        "sphinxcontrib-jsmath": {
+            "hashes": [
+                "sha256:2ec2eaebfb78f3f2078e73666b1415417a116cc848b72e5172e596c871103178",
+                "sha256:a9925e4a4587247ed2191a22df5f6970656cb8ca2bd6284309578f2153e0c4b8"
+            ],
+            "version": "==1.0.1"
         },
         "sphinxcontrib-phpdomain": {
             "hashes": [
-                "sha256:14ecb0b477dddf8ce2c69b72ab15e3455a591d077264808a4f0d35f488b54a5f",
-                "sha256:ec0286d66233839994a2c812345bbd3f02feca28da941b552bce7d48eb8980f4"
+                "sha256:5e0deb919e41e19c3f74ed04324ce96535d677c940d152b3e8f62f8d1a0526a9",
+                "sha256:fec906994c07fd4ccaaaa25c6f8691e4f32b4278afc58eacbc9809460c99a363"
             ],
             "index": "pypi",
-            "version": "==0.4.1"
+            "version": "==0.7.0"
+        },
+        "sphinxcontrib-qthelp": {
+            "hashes": [
+                "sha256:4c33767ee058b70dba89a6fc5c1892c0d57a54be67ddd3e7875a18d14cba5a72",
+                "sha256:bd9fc24bcb748a8d51fd4ecaade681350aa63009a347a8c14e637895444dfab6"
+            ],
+            "version": "==1.0.3"
         },
         "sphinxcontrib-seqdiag": {
             "hashes": [
-                "sha256:83c3fdac7e083c5b217f65359c03b75af753209028db6b261b196aff19e7003f",
-                "sha256:c83f2b552e8e0829dbee22a13c5025f33c0b31a7e87bb589611928c2883d3db5"
+                "sha256:4c7275adafd6d97fe541a0e319b2f6ed5327d2558f240a7080a32b3e12f4258d",
+                "sha256:f1a18953e9ccc0b316d7c28edfb97048030dea9bc37c97480dbc0bed5851d377"
             ],
             "index": "pypi",
-            "version": "==0.8.5"
+            "version": "==2.0.0"
         },
-        "sphinxcontrib-websupport": {
+        "sphinxcontrib-serializinghtml": {
             "hashes": [
-                "sha256:68ca7ff70785cbe1e7bccc71a48b5b6d965d79ca50629606c7861a21b206d9dd",
-                "sha256:9de47f375baf1ea07cdb3436ff39d7a9c76042c10a769c52353ec46e4e8fc3b9"
+                "sha256:eaa0eccc86e982a9b939b2b82d12cc5d013385ba5eadcc7e4fed23f4405f77bc",
+                "sha256:f242a81d423f59617a8e5cf16f5d4d74e28ee9a66f9e5b637a18082991db5a9a"
             ],
-            "version": "==1.1.0"
+            "version": "==1.1.4"
         },
         "urllib3": {
             "hashes": [
-                "sha256:41c3db2fc01e5b907288010dec72f9d0a74e37d6994e6eb56849f59fea2265ae",
-                "sha256:8819bba37a02d143296a4d032373c4dd4aca11f6d4c9973335ca75f9c8475f59"
+                "sha256:3018294ebefce6572a474f0604c2021e33b3fd8006ecd11d62107a5d2a963527",
+                "sha256:88206b0eb87e6d677d424843ac5209e3fb9d0190d0ee169599165ec25e9d9115"
             ],
-            "version": "==1.24"
+            "version": "==1.25.9"
         },
         "webcolors": {
             "hashes": [
-                "sha256:030562f624467a9901f0b455fef05486a88cfb5daa1e356bd4aacea043850b59",
-                "sha256:b3b88e5ef2b35fa9e01e3fabe99dddf49da074459c44774c59f3ccab3be4f121"
+                "sha256:76f360636957d1c976db7466bc71dcb713bb95ac8911944dffc55c01cb516de6",
+                "sha256:b8cd5d865a25c51ff1218f0c90d0c0781fc64312a49b746b320cf50de1648f6e"
             ],
-            "version": "==1.8.1"
+            "version": "==1.11.1"
         }
     },
     "develop": {}

source/sphinxext/cacert.py

@@ -40,7 +40,7 @@ class SourceFileRole(roles.XRefRole):
             indexnode = addnodes.index()
             targetid = 'index-%s' % env.new_serialno('index')
             targetnode = nodes.target('', '', ids=[targetid])
-            doctitle = document.traverse(nodes.title)[0].astext()
+            doctitle = list(document.traverse(nodes.title))[0].astext()
             idxtext = "%s; %s" % (node.astext(), doctitle)
             idxtext2 = "%s; %s" % ('sourcefile', node.astext())
             indexnode['entries'] = [