Updated test matrix -- Django Dev dropped support for Python3.6 and 3.7

[smithdc1]

Updated test matrix -- Django Dev dropped support for Python3.6 and 3.7

Description

Django's master branch has now dropped support for Python 3.6 and 3.7. Djang 3.2 will be the last version to support these Python versions.

Related Issue

#799

Motivation and Context

How Has This Been Tested?

I've tested this on my own fork and have seen the github action tests now passing with this patch.
I've not updated the changelog as I've not actually changed anything that would be included in the release. I think this will come when Django 4.0 support is released (some time yet!)

Types of changes

• [ x ] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ x ] I have run the make format command to format my code
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• [ x ] I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• [ x ] I have added my name and/or github handle to AUTHORS.rst
• I have added my change to CHANGES.rst
• [ x ] All new and existing tests passed.

[codecov]

Codecov Report

Merging #800 (16888b9) into master (e8b9ce0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #800   +/-   ##
=======================================
  Coverage   97.47%   97.47%           
=======================================
  Files          18       18           
  Lines         992      992           
  Branches      151      151           
=======================================
  Hits          967      967           
  Misses         12       12           
  Partials       13       13           

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[ThePumpingLemma]

Nice!