Update colorama to 0.4.5

[pyup-bot]

This PR updates colorama from 0.4.3 to 0.4.5.

Changelog

0.4.5

* Catch a racy ValueError that could occur on exit.
* Create README-hacking.md, for Colorama contributors.
* Tweak some README unicode characters that don't render correctly on PyPI.
* Fix some tests that were failing on some operating systems.
* Add support for Python 3.9.
* Add support for PyPy3.
* Add support for pickling with the ``dill`` module.

0.4.4

* Re-org of README, to put the most insteresting parts near the top.
* Added Linux makefile targets and Windows powershell scripts to
 automate bootstrapping a development environment, and automate the
 process of testing wheels before they are uploaded to PyPI.
* Use stdlib unittest.mock where available
* Travis CI now also builds on arm64
* Demo06 demonstrates existing cursor positioning feature
* Fix OSC regex & handling to prevent hang or crash
* Document enterprise support by Tidelift

Links

• PyPI: https://pypi.org/project/colorama
• Changelog: https://pyup.io/changelogs/colorama/
• Repo: https://github.com/tartley/colorama

[pyup-bot]

Closing this in favor of #370