Update README.md to use fetch_ca_certs.py

README.md

@@ -10,7 +10,12 @@
 ## Generating the Markdown/SVG files
 
 1. Get the CA certificates of the CAs from their corresponding web sites
-2. Run the generation script and filter through `pandoc` for better markdown layout
+
+   ```shell
+   poetry run python3 fetch_ca_certs.py
+   ```
+
+3. Run the generation script and filter through `pandoc` for better markdown layout
 
    ```shell
    for dir in cacert certum dtrust globalsign letsencrypt sectigo