Setup probot-linter #39
Description
With the great work by @Jan-Ka setting up .editorconfig, .eslintrc.json and .vscode/settings.json in #26 and #32, we now have a nice base for using probot-linter to automatically cleaning up code for any incoming PRs moving forward.
This way we relieve more of the the human effort, from contributors and maintainers alike, to tackle the actual code changes, and leave the formatting to be taken care of by the bot :)