fixing issue with setup.py and bumping version to v3.1.2

[jogomojo]

setup.py depended on GitHub versions of PYNQ-Metadata and PYNQ-Utils, which did not play nice with PyPI. This was causing pip install pynq to fail in some circumstances.

Updated setup.py to pull Metadata and Utils from PyPI and bumping version to v3.1.2

[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 (80d95c7).
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Additional details and impacted files

@@               Coverage Diff                @@
##           image_v3.1.2    #1515      +/-   ##
================================================
- 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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