Merge branch 'sg/complete-decorate-full-not-long' into maint

The completion for "log --decorate=" parameter value was incorrect.

* sg/complete-decorate-full-not-long:
  completion: fix and update 'git log --decorate=' options

Author: gitster

contrib/completion/git-completion.bash

@@ -1448,7 +1448,7 @@ _git_log ()
 		return
 		;;
 	--decorate=*)
-		__gitcomp "long short" "" "${cur##--decorate=}"
+		__gitcomp "full short no" "" "${cur##--decorate=}"
 		return
 		;;
 	--*)