Merge branch 'release/3.2.0' into new-master

Upgrade requests

Upgrade requests to 2.22.0. Previously was set to 2.3.0, but 2.22.0 is
the latest version. The version we end up with does not recognize `json`
as a keyword argument to requests.put/post.

GitHub: https://github.ibm.com/cloudant/service_engineering/issues/426

tag dev builds

GitHub: https://github.com/cloudant/service_engineering/issues/408

Merge branch 'release/3.1.2' into new-master

Merge branch 'release/3.1.1' into new-master

Merge branch 'release/3.1.0' into new-master

Merge branch 'release/3.0.0' into new-master

Merge branch 'release/2.0.2' into new-master

Merge branch 'release/2.0.1' into new-master

Release 2.0.0