Move testing to github actions

[sjsrey]

Follow libpysal

[jGaboardi]

I can try to get to this tomorrow.

[jGaboardi]

To Do:

• [x] create .github/workflows/unittests.yml
  • [x] Support Python 3.6, 3.7, 3.8
  • [x] Support Linux, macOS, Windows
• [x] create environment .yml files in ci/
• [ ] disable coveralls
• [ ] disable Travis
• [ ] enable Codecov
• [ ] set the CODECOV_TOKEN in pysal/pointpats/Setting/Secrets
• [x] remove coveralls/nose/etc. from requirements*.txt
• [x] add codecov/pytest/etc. to requirements*.txt
• [x] add .coveragerc
• [x] update setup.py
  • [x] test_suite and tests_require parameters in setup
  • [x] classifiers parameters in setup for Python 3.6, 3.7, 3.8
• [x] add unittests badge for GHA to README.md
• [x] add codecov badge to README.md
• [x] remove .travis.yml

[jGaboardi]

opencv-contrib-python is causing a problem with GHA in /jGaboardi/pointpats. It doesn't seem to be used anymore, so removing to see if tests run successfully.

802 Solving environment: ...working... failed
803 ##[warning]
804 ResolvePackageNotFound: 
805 - opencv-contrib-python[version='>=4.2.0']

[jGaboardi]

opencv-contrib-python is used in many instances in the code itself to as cv2/cv.

[martinfleis]

Done.