Bumped version to 1.6.3.
Bumped version to 1.6.3.

cmars/tools,syohex/the_platinum_searcher,cmars/tools,monochromegane/the_platinum_searcher,aeruder/the_platinum_searcher,tw4452852/the_platinum_searcher,thomasf/the_platinum_searcher,cmars/tools,DaSea/the_platinum_searcher,yuya-takeyama/the_platinum_searcher,cmars/tools