Prepare 0.11.0 Bump version and update changelog.

Update changes for release [Revisionist Note] This commit was originally c6a0c80, still available on the main-pre-rewrite branch. The 0.10.0 tag used to point to it.

Prepare release 0.9.2 

Prepare 0.9.1 

Document the release process. 

We can get the version from git for pip installs. Fixes #3 Maybe we should tag from setup.py instead

Prepare 0.8.1