* Refactored get_collection_coverage tests
Using pytest's parametrize mark. This makes it easier to isolate test cases in order to fix the errors that are showing up when running under Python3.8
* Refactor tests from test_api.py that were failing under Python 3.8
* Fix flake8 issues
* Add Python 3.8 to the CI matrix
* Replaced pandas usage with numpy for datetime
* Reverted tests back to non-parametrized form
* Dropped Python 3.7 from main github CI workflow
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Co-authored-by: Ricardo Garcia Silva <ricardo@kartoza.com>
Ricardo Garcia Silva
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