update docs

add ResponseError into docs

adding friend/mp by wxid is now not available

update readme

fix .send_image() issue

Messages.forward() now supports personal cards sent from self

increase session default max_retries (3 -> 30)

Merge branch 'develop' of https://github.com/youfou/wxpy into develop

v0.3.3

1. temporarily fix itchat version requirement to 1.2.32, to avoid some instability;
2. remove the special info about aliyun pypi mirror;
3. adjust some emoji selection for `sync_message_in_groups`;
4. fix that `Message.url` was not unescaped;
5. add `MAP` message support for `Message.forward()`.

update doc