fixing issue with setup.py and bumping version to v3.1.2 (#1515)

[jogomojo]

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 35.10%. Comparing base (bae1409) to head (62f8175).
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1516      +/-   ##
==========================================
- Coverage   35.11%   35.10%   -0.02%     
==========================================
  Files          30       30              
  Lines        4650     4649       -1     
  Branches      814      814              
==========================================
- Hits         1633     1632       -1     
  Misses       2957     2957              
  Partials       60       60              

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