增加 User-Agent
增加 User-Agent

Changes to be committed:
	modified:   weixin.py

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