Remove bit about authors from contributing guide

Fergal Hainey · blueyed · commit 85bbe4706aa1 · 2018-07-26T11:01:36.000+02:00
This is now tracked by GitHub
diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
@@ -7,7 +7,6 @@ I’ve collected a few tips to get you started.
 Please:
 
 - *Always* add tests for your code.
-- Add yourself to the AUTHORS.rst file in an alphabetical fashion by first name – no matter how big or small your changes are.
 - Write `good commit messages`_.
 
 
