Improve CI to test more django-python version combo

[CFarcy]

No description provided.

[codecov]

Codecov Report

Merging #48 (6a93fdb) into master (55c0d1e) will decrease coverage by 0.66%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #48      +/-   ##
==========================================
- Coverage   89.10%   88.44%   -0.67%     
==========================================
  Files          14       14              
  Lines         404      398       -6     
==========================================
- Hits          360      352       -8     
- Misses         44       46       +2     

Impacted Files	Coverage Δ
terra_accounts/models.py	80.28% <0.00%> (-3.51%)	⬇️
terra_accounts/views.py	96.59% <0.00%> (-0.12%)	⬇️

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[codeclimate]

Code Climate has analyzed commit 6a93fdb and detected 0 issues on this pull request.

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