Cut a 2.0.1 release

[chrisjkuch]

After closing #336 and fixing #419 we'll be ready for a 2.0.1 release, and then can add in a number of great features that are on the docket!

[chrisjkuch]

@pjbull the release workflow failed on the upload to test pypi. When you get a chance, can you check that the necessary secrets are correctly configured?