安装Mysqlclient 失败

需要安装Mysqlclient，如果pip安装Mysqlclient失败.
``` shell
# 使用pip安装.whl
# https://www.lfd.uci.edu/~gohlke/pythonlibs/#mysqlclient
pip install <.whl>
```
如果 pip install <.whl> 失败，is not a supported wheel on this platform
``` shell
# AMD64
import pip._internal; print(pip._internal.pep425tags.get_supported())
# WIN32
import pip;print(pip.pep425tags.get_supported())

在CMD执行命令：python -m pip debug --verbose

https://www.lfd.uci.edu/~gohlke/pythonlibs/#mysqlclient