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I made the following updates:

updated versions for github actions : Node 16 -> Node 20
- setup-python
- upload-artifact
- download-artifact
testing support
- I created a testpy_ci.yaml for publishing to testpy (I could not push though because you already have one (oops))
- To test I found that pip install mkdocs_build_plantuml_plugin@git+https://github.com/babeloff/mkdocs_build_plantuml works
  - This might be a good thing to add to the documentation
IDE : I use PyCharm so I added .idea/ to the .gitignore
In the README I made the httplib2 dependency a link to make it clearer that it needs to be installed
I ported all the os.path stuff to use pathlib
I changed the URL for the PlantUML server to use https
On the include file processing I changed it to test for the file existence rather than catching the exception.
I changed a number of places where strings are constructed to use the f"..." formatted string
I added a message indicating what diagram is being processed earlier in the flow. The exception I was getting happened before the Converting message

I think that is all.

quantorconsulting / mkdocs_build_plantuml