Add __repr__ for exception classes
Add __repr__ for exception classes

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