update VERSION to 3.1.5
update VERSION to 3.1.5

RubyMoney/money,BrandyMint/money,envato/money,bonusly/money,pixeltrix/money,paulodiniz/money,bnmrrs/money,nilbus/money,kewaunited/money,maicoin/money,richardvenneman/money,saizai/money,gregoryhappyfresh/money,antstorm/money,AlexVPopov/money,printercu/money,insphire/money