UnicodeDecodeError when install from source.

[ChiahungTai]

🐛 Bug Description

Run python setup.py install in source code repo might cause unicode decode error in some Windows language(ex. Big5)
Error message.
UnicodeDecodeError: 'cp950' codec can't decode byte 0xe9 in position 3935: illegal multibyte sequence

To Reproduce

Steps to reproduce the behavior:

1. Install from source in a Big5 Windows OS.

Expected Behavior

No error message

Screenshot

Environment

Note: User could run cd scripts && python collect_info.py all under project directory to get system information
and paste them here directly.

• Qlib version: 0.8.0.99
• Python version: 3.8
• OS (Windows, Linux, MacOS): Windows
• Commit number (optional, please provide it if you are using the dev version):
  ef16171

Additional Notes

[you-n-g]

Thank you for solving this problem here #773