Add a long description for the package.
Review Request #9804 — Created March 18, 2018 and submitted
This adds a long description that will show up on PyPI. It uses the
README.rstfor the repository. This will help visitors on PyPI get an
idea about Review Board, support options, etc. without having to visit
the site or the GitHub repository.
Built the package and inspected the metadata to make sure the description