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* Require Python 3.6 or later.
* Removed 'make-namespace-package' command associated
functionality in ``namespace`` module.
* Removed Bitbucket-related functionality. Nobody is going
to need that again.
* Removed Github module. Use `hub <https://hub.github.com/>`_
command.
* Removed selenium code that is old and with limited utility
except on Windows.
* Removed all other command-line scripts.