Fixed wrong usage when invalid option was specified.
Fixed wrong usage when invalid option was specified.

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