hall of fame: 2.12.x is default branch now

Author: SethTisue

contribute/scala-fame.md

@@ -7,7 +7,7 @@ A big thank you to everyone who has contributed over the years to:
  - [the Scala library and compiler](https://github.com/scala/scala/contributors)
  - [the Scala documentation website](https://github.com/scala/scala.github.com/contributors)
 
-What follows are the commit totals, to the 2.11.x branch of the scala/scala repo only,
+What follows are the commit totals, to the 2.12.x branch of the scala/scala repo only,
 for last month.  (For a commit to be counted, it must have been both committed and merged
 in the same month.)