Update contributing guide. Closes #191 #192
Update contributing guide. Closes #191 #192

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