Update CONTRIBUTING

CONTRIBUTING

@@ -10,16 +10,6 @@ There are just a few small guidelines you need to follow.
 
 ## Contributor License Agreement
 
-Contributions to this project must be accompanied by a Contributor License
-Agreement. You (or your employer) retain the copyright to your contribution;
-this simply gives us permission to use and redistribute your contributions as
-part of the project. Head over to <https://cla.developers.google.com/> to see
-your current agreements on file or to sign a new one.
-
-You generally only need to submit a CLA once, so if you've already submitted one
-(even if it was for a different project), you probably don't need to do it
-again.
-
 ## Code reviews
 
 All submissions, including submissions by project members, require review. We