add google_currency.gem to Currency Exchange implementations list
add google_currency.gem to Currency Exchange implementations list

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