Remove old stuff about release managers

Author: mattwynne

CONTRIBUTING.md

@@ -70,19 +70,3 @@ Now release it
     # Make sure you run gem signin as the [email protected] user before running the following step. Credentials can be found in 1Password
     rake release
 
-## Gaining Release Karma
-
-To become a release manager, create a pull request adding your name to the list below, and include your Rubygems email address in the ticket. One of the existing Release managers will then add you.
-
-Current release managers:
-  * [Matt Wynne](https://rubygems.org/profiles/mattwynne)
-  * [Aslak Hellesøy](https://rubygems.org/profiles/aslakhellesoy)
-  * [Oleg Sukhodolsky](https://rubygems.org/profiles/os97673)
-  * [Steve Tooke](https://rubygems.org/profiles/tooky)
-  * [Björn Rasmusson](https://rubygems.org/profiles/brasmusson)
-  * [Andrew Walter](https://rubygems.org/profiles/xtrasimplicity)
-
-To grant release karma, issue the following commands:
-
-    gem owner cucumber --add <NEW OWNER RUBYGEMS EMAIL>
-    gem owner cucumber-core --add <NEW OWNER RUBYGEMS EMAIL>