pypi: Release 0.5.0.

pypi: Release 0.4.7.

pypi: Release version 0.4.6.

This includes a critical bug fix for call_on_each_event.

pypi: Release 0.4.5.

We just made a minor change to our Git integration, so that warranted
a new release so I could update the docs on the zulip/zulip repo.

pypi: Release version 0.4.4.

This includes some important changes after the release of pip 10.

pypi: Release version 0.4.3.

Making this release due to recent changes made to the Trello script.

pypa: Release version 0.4.2.

pypi_packaging: Release version 0.4.1.

packages: Release 0.4.0.

packaging: Upgrade to release 0.3.9.