message: docs: update CONTRIBUTING link in README.md
diff: @@ -22,7 +22,7 @@ Angular is a development platform for building mobile and desktop web applicatio
  ## Want to help?
  Want to file a bug, contribute some code, or improve documentation? Excellent! Read up on our
  -guidelines for [contributing][contributing] and then check out one of our issues in the [hotlist: community-help](https://github.com/angular/angular/labels/hotlist%3A%20community-help).
  +guidelines for [contributing][docs/contributing] and then check out one of our issues in the [hotlist: community-help](https://github.com/angular/angular/labels/hotlist%3A%20community-help).
  [browserstack]: https://www.browserstack.com/
  [contributing]: http://github.com/angular/angular/blob/master/CONTRIBUTING.md
  