writeRefAxes fix for Python 3

[sseraj]

Purpose

.keys() in Python 3 does not return a list, so writeRefAxes has been broken.

Type of change

• [x] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (non-backwards-compatible fix or feature)
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no API changes)
• [ ] Documentation update
• [ ] Maintenance update
• [ ] Other (please describe)

Testing

I added a test that just checks if files have been written.

Checklist

• [x] I have run flake8 and black to make sure the code adheres to PEP-8 and is consistently formatted
• [x] I have run unit and regression tests which pass locally with my changes
• [x] I have added new tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation

[codecov[bot]]

Codecov Report

Merging #107 (6819946) into master (8e0c217) will increase coverage by 0.23%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #107      +/-   ##
==========================================
+ Coverage   60.38%   60.62%   +0.23%     
==========================================
  Files          40       40              
  Lines        9764     9764              
==========================================
+ Hits         5896     5919      +23     
+ Misses       3868     3845      -23     

Impacted Files	Coverage Δ
pygeo/parameterization/DVGeo.py	65.36% <100.00%> (+0.36%)	:arrow_up:
pygeo/pyNetwork.py	61.07% <0.00%> (+10.73%)	:arrow_up:

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[marcomangano]

Does this address https://github.com/mdolab/pygeo/issues/69 ?

[sseraj]

Does this address #69 ?

Yes, thanks for catching that.