docs(README): update angular commit message link

Author: AndersDJohnson

README.md

@@ -16,7 +16,8 @@ Used by [commitizen/cz-conventional-changelog](https://github.com/commitizen/cz-
 Can be used with [kentcdodds/validate-commit-msg](https://github.com/kentcdodds/validate-commit-msg#types).
 
 Commit types originally from:
-* [AngularJS Git Commit Message Conventions](https://docs.google.com/document/d/1QrDFcIiPjSLDn3EL15IJygNPiHORgU1_OOAqWjiDU5Y/edit#heading=h.8gbcep5xnw19)
+* https://github.com/angular/angular/blob/master/CONTRIBUTING.md#type
+* [AngularJS Git Commit Message Conventions](https://github.com/angular/angular/blob/master/CONTRIBUTING.md#type)
 * [commitizen/cz-conventional-changelog](https://github.com/commitizen/cz-conventional-changelog)
 
 Created for [adjohnson916/conventional-commit-types-cli](https://github.com/adjohnson916/conventional-commit-types-cli).