[$] Using GitHub Issues for Python

In a 2018 Python Language Summit talk that was initially billed as"Mariatta's Topic of Mystery", Mariatta Wijaya described her reasoning for advocating moving Python awayfrom its current bug tracker toGitHub Issues. She wanted to surprise her co-attendees with the talktopic at least partly because it is somewhat controversial. But it wouldcomplete Python's journey to GitHub that started a ways back.