Merge changes from theiconic/generate-plantuml-action

[wyrfel]

Includes the following changes made on theiconic/generate-plantuml-action:

• add support for more extensions for both PlantUML files as well as Markdown Files
• add support for saving files to the same folder as source files by specifying . for the path option
• resolve security issues in dependencies via npm audit fix --force
• ignore deleted files in the changesets
• make commit message configurable and change default message to Render PlantUML files
• update README.md for extended extension support and updated version in github action config snippet
• setup github actions workflow for automated test runs and coverage reporting to CodeClimate

[grassedge]

Amazing! Thanks a lot ☺

[wyrfel]

Thanks @grassedge for merging. You'll probably want to change the github action badge in the readme to use your repo, not ours (replace theiconic with grassedge). 😊