Show HN: rfilerunner: a simple command runner

Hey HN! This is a little project I made a few months ago and have been using on every project since. Where before I'd use Makefiles to keep all the necessary commands for a project written down, rfilerunner has some more accessible expressiveness (i.e. I can just write bash or Python), built-in file watching and parallel execution, and niceties in making simple project-specific CLIs.