Better `__repr__` and `__str__` for WeChatPayException
Better `__repr__` and `__str__` for WeChatPayException

cloverstd/wechatpy,zaihui/wechatpy,zhaoqz/wechatpy,messense/wechatpy,zhaoqz/wechatpy,jxtech/wechatpy,hunter007/wechatpy,hunter007/wechatpy,wechatpy/wechatpy,zaihui/wechatpy,cloverstd/wechatpy