How to dynamically update an existing README.md with a list of WordPress plugins?

If possible, I'd like to automatically append a list of WordPress plugins onto an existing README file (preferably markdown). I've been fiddling around with this idea but so far I am only able to pipe file names within a given directory into a new file in JSON format by using gulp-filelist. Perhaps this is a start.

To be clear, the desired solution might be a command line tool that can be run intermittently; there is no need for real-time updates if such a thing is too much of a headache (or impossible). Additionally, while it would be excellent to see a list of active WP plugins and version numbers, a mere list of all installed plugins would suffice.

via Chebli Mohamed