reformat Variant file
Merge branch 'master' of git://github.com/ornicar/scalachess

* 'master' of git://github.com/ornicar/scalachess:
  Improve antichess stalemate condition unit test slightly
  Fix for bug whereby two opposing bishops on the same color of diagonal was resulting in a draw in the antichess variant.
  Fixing bug whereby traditional checkmate is treated as a draw.