Updating to Python 3.7

[srivarra]

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What is the purpose of this PR?

Closes #506.

Many Libraries have stopped supporting Python 3.6, and more will follow. In order to continue to get support / new features we need to upgrade our Python Version. We'll start with 3.7 and decide if it's worth bumping it up higher.

How did you implement your changes

Adjusted the .travis.yml, Dockerfile, .readthedocs.yml and setup.py.

Remaining issues

Outdated Packages

Package            Version Latest Type
------------------ ------- ------ -----
coverage           5.5     6.4    wheel
coveralls          1.11.1  3.3.1  wheel
cryptography       3.4.8   37.0.2 wheel
ipympl             0.7.0   0.9.1  wheel
jedi               0.17.2  0.18.1 wheel
matplotlib         2.2.5   3.5.2  wheel
mistune            0.8.4   2.0.2  wheel
pandas             0.25.3  1.3.5  wheel
parso              0.7.1   0.8.3  wheel
pluggy             0.13.1  1.0.0  wheel
pytest             5.4.3   7.1.2  wheel
pytest-asyncio     0.17.0  0.18.3 wheel
pytest-cov         2.12.1  3.0.0  wheel
pytest-pycodestyle 2.2.1   2.3.0  sdist
scikit-image       0.16.2  0.19.2 wheel
scikit-learn       0.24.2  1.0.2  wheel
xarray             0.17.0  0.20.2 wheel

Issues

• Testing:
  • pytest fails to run as pytest-asyncio is out of date.
    • The issue has to do with the addini function used in argparsing.py. Here is a link to the issue.
    • Updating pytest-asyncio requires updating pytest.
  • visualize_test.py::test_plot_barchart and visualize_test.py::test_visualize_patient_population_distribution fail due to a typing error in pandas.
    • We will need to update pandas at the very least.
  • xarray needs to be updated as a consequence

Packages to Update

• pytest
• pytest-asyncio
• pandas
• xarray

[ngreenwald]

nice

…

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