Set the branch stable.

git-svn-id: https://svn.redmine.org/redmine/branches/5.1-stable@22412 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine/version.rb

@@ -13,7 +13,7 @@ module Redmine
     # * official release: nil
     # * stable branch:    stable
     # * trunk:            devel
-    BRANCH = 'devel'
+    BRANCH = 'stable'
 
     # Retrieves the revision from the working copy
     def self.revision