readme

README.md

 # mfm.js
-An MFM parser implementation with PEG.js.
+An MFM parser implementation with TypeScript.
 [Try it out!](https://runkit.com/npm/mfm-js)
 
 [![Test](https://github.com/misskey-dev/mfm.js/actions/workflows/test.yml/badge.svg)](https://github.com/misskey-dev/mfm.js/actions/workflows/test.yml)