Use tox to run test case on Appveyor
Use tox to run test case on Appveyor

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