docs: add rev-dep to qa tools (#970)

Author: jayu

README.md

@@ -215,6 +215,7 @@ A collection of awesome browser-side [JavaScript](https://developer.mozilla.org/
 * [Pre-evaluate code at buildtime](https://github.com/kentcdodds/preval.macro) - Pre-evaluate your front end javascript code at build-time
 * [JS-Beautifier](https://github.com/beautify-web/js-beautify) - Npm cli and library to format JS code.
 * [husky](https://github.com/typicode/husky) - Prevents bad git commit, git push and more.
+* [Rev-dep](https://github.com/jayu/rev-dep) - Trace imports, identify circular dependencies, find unused code, clean node modules — all from a blazing-fast CLI.
 
 ## MVC Frameworks and Libraries