Bumped version to 1.5.2.
Bumped version to 1.5.2.

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