Reformat beta version
Reformat beta version

Makes version compatible with RubyGems `~>` comparator.
Acidburn0zzz/rugged,saraid/rugged,Acidburn0zzz/rugged,Acidburn0zzz/rugged,saraid/rugged,libgit2/rugged,tpickett66/rugged,tpickett66/rugged,tpickett66/rugged,spraints/rugged,libgit2/rugged,spraints/rugged,saraid/rugged,libgit2/rugged