Add utility function check_signature
Add utility function check_signature

Dufy/wechatpy,messense/wechatpy,chenjiancan/wechatpy,cysnake4713/wechatpy,mruse/wechatpy,navcat/wechatpy,cloverstd/wechatpy,EaseCloud/wechatpy,cysnake4713/wechatpy,navcat/wechatpy,Luckyseal/wechatpy,chenjiancan/wechatpy,jxtech/wechatpy,hunter007/wechatpy,mruse/wechatpy,hunter007/wechatpy,zhaoqz/wechatpy,Luckyseal/wechatpy,EaseCloud/wechatpy,Dufy/wechatpy,zhaoqz/wechatpy,tdautc19841202/wechatpy,tdautc19841202/wechatpy,cysnake4713/wechatpy,zaihui/wechatpy,tdautc19841202/wechatpy,zaihui/wechatpy,cloverstd/wechatpy,wechatpy/wechatpy,Luckyseal/wechatpy