Georss-generic-client

* Bumped version of upstream [python-georss-client](https://github.com/exxamalte/python-georss-client) library to v0.17 that fixes a backwards compatibility issue with a fault in v0.16.
* Added Python 3.11 support.
* Added Python 3.12 support.
* Removed Python 3.7 support.
* Bumped library versions: black, flake8, isort.
* Migrated to pytest.
* Code quality improvements.

* No functional changes.
* Added Python 3.10 support.
* Removed Python 3.6 support.
* Bumped version of upstream GeoRSS library.
* Bumped library versions: black, flake8, isort.
* Migrated to github actions.

* Add license tag (thanks fabaff).
* Added Python 3.9 support.
* Bump georss_client to v0.14.
* General code improvements.

* Added Python 3.8 support.
* Excluded tests from package.

* Using version 0.10 of upstream [python-georss-client](https://github.com/exxamalte/python-georss-client) library.
* Fix handling feeds starting with byte order mark.

* Using version 0.9 of upstream [python-georss-client](https://github.com/exxamalte/python-georss-client) library.
* Dropped Python 3.5 support.