V022release (#384)

* Update history for release

* Bump version: 0.21.0 → 0.22.0

Update NiPyAPI to be roughly forward compatible with NiFi-2.x line. (#…

…368)

* Instruct pyup to ignore pytest in requirements txt
* instruct pytest to not report insecure http requests to localhost for docker testing
* Templates are deprecated in nifi-2x, remove from tests for newer versions
* add function to check registry version using newer aboutapi() call
* update utils.check_version to ignore any non-semver elements of a version string and use newer registry version api call if available
* Update registry client creation to handle nifi-2x structure
* Update Testing to treat NiFI-2.x as regression target
* Deprecate very old nifi-1x versions from regression testing
* Fix get processor test to use a processor available in all nifi versions, GenerateFlowfile
* Update readme about NiFi2.x support.
* Switch 'latest' dockerfile to use 'latest' nifi tags.

readthedocs yaml config

File was supposed to be a dot file, Visual Studio decided I didn't need it.

Bump version: 0.19.0 → 0.19.1

Bump version: 0.18.0 → 0.19.0

Bump version: 0.17.1 → 0.18.0

Bump version: 0.17.0 → 0.17.1

Bump version: 0.16.3 → 0.17.0

Bump version: 0.16.2 → 0.16.3

Tag for Release v0.16.2