Create release runbook wiki-page

[timothyb0912]

Request

Create a wiki page on the repo that describes (in detail) the steps to be performed before releasing a new version of PyLogit to PyPI and Conda. Should include instructions about and a checklist for passing all tests, updating the changelog, bumping the package version number, uploading files to PyPI and Conda, etc. See tools like the following for updating one's changelog and the following for bumping one's version number.