Beta release 2.57.0

Multiple files in one commit 🎉

This release implements the most requested feature so far: putting multiple files in one commit. This means that publishing many files at once, will only trigger one deploy in Vercel/Netlify/etc.
At most, the plugin will do two commits, one for changed/new files and another one for deleted files.

Additionally the performance of publishing has increased dramatically, as the file upload are now done in parallel.

This closes
#115
#475
#320

Beta

I'm releasing this as a beta version to start with. If you have any feedback, please let me know in the Discord!
You can install the beta automatically by using BRAT.