Merge pull request #2509 from takluyver/rever-3.12.1

Prepare to release 3.12.1

Merge pull request #2504 from takluyver/rever-3.12

Prepare to release 3.12

Merge pull request #2405 from takluyver/rever-3.11

Prepare to release 3.11.0

Merge pull request #2321 from takluyver/whatsnew-3.10

Prepare release notes for 3.10

Merge pull request #2277 from takluyver/rever-3.9

Prepare to release 3.9

Merge pull request #2218 from takluyver/travis-wheels-gh-releases

Try uploading wheels from Travis to Github releases instead of anaconda.org

Merge pull request #2214 from takluyver/rever-3.8

Prepare to release 3.8

Merge pull request #2103 from takluyver/rever-3.7

Prepare to release 3.7

Merge pull request #2002 from takluyver/rever-3.6

Prepare to release 3.6

Merge pull request #1978 from takluyver/rever-3.5

Prepare to release 3.5