optimize: support directly open QRcode image on mac osx
optimize: support directly open QRcode image on mac osx

yanxurui/WeixinBot,bobolau/wxrobot,bobolau/wxrobot,Urinx/WeixinBot,yzxky/WeixinBot,yzxky/WeixinBot,Urinx/WeixinBot,yanxurui/WeixinBot