Aio-georss-client

* Added Python 3.12 support.
* Removed Python 3.7 support.
* Bumped library versions: black, flake8, isort.
* Migrated to pytest.
* Code quality improvements.

* Added Python 3.11 support.
* Removed deprecated asynctest.
* Bumped library versions: black, haversine, dateparser, xmltodict.

* Improve error handling where the GeoRSS feed provides invalid XML.

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

* Add license tag (thanks fabaff).
* Set aiohttp to a release 3.7.4 or later (thanks fabaff).

* Add non-standard namespace used by [EMSC feed](https://www.emsc-csem.org/service/rss/rss.php).