Streamline QC text

CONTRIBUTE.md

@@ -19,7 +19,7 @@ If you want to become part of the team or you need help, please say hi in [gitte
 ## Quality Control
 - If there is anything wrong with a commit do one of the following
   - Only if you can't fix it yourself comment objectively on the commit and tell the commiter exactly what the commit breaks. If you don't do this polite don't expect anyone to answer you or implement your wish.
-  - Implement the change yourself and if you are not sure if everybody will agree then propose the change as a pull request (either way the possibility to travel back in time is implied by git so mistakes are not to be treated as a catastrophy. If you want to do that you should work on center stage in a theater not on an open source project). 
+  - Implement the change yourself and if you are not sure if everybody will agree then propose the change as a pull request. 
 
 ## Writers
 - Create a github account