2020.12

Changelog

• Updated the readme, to remind user to install the package in a virtual environment. (#41)
  Contributed by Mariatta.
• Updated the package url, using the GitHub repository instead of docs.python.org (#49)
  Contributed by Pradyun Gedam.
• Added license information to the footer of the doc (#36)
  Contributed by Todd.
• Fixed typo in the footer (#52)
  Contributed by Dominic Davis-Foster.
• Added information on how to use the package (#32)
  Contributed by Tapasweni Pathak.
• Fixed code formatting (#53).
  Contributed by Hugo van Kemenade.
• Fixed code bgcolor and codetextcolor for Sphinx 3.1.0+ (#57)
  Contributed by Zhiming Wang.