Add list_epic_attributes()

[gavanfantom]

Description

Describe:

This adds a list_epic_attributes() function, working the same way as list_user_story_attributes().

References

Fix #103

Checklist

• [x] I have read the contribution guide
• [x] Code lint checked via inv lint
• [x] changes file included (see docs)
• [x] Usage documentation added in case of new features
• [x] Tests added

[coveralls]

Coverage increased (+0.01%) to 97.838% when pulling 6aa2c53f1a2ab1bd5794c6c443ff142480775aaf on gavanfantom:master into 71888ddec9d2ed5271e0c5ec524ebbcde898ed6d on nephila:master.

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02 :tada:

Comparison is base (923cabc) 96.35% compared to head (0dc4c14) 96.38%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #104      +/-   ##
==========================================
+ Coverage   96.35%   96.38%   +0.02%     
==========================================
  Files           8        8              
  Lines         878      884       +6     
  Branches       66       66              
==========================================
+ Hits          846      852       +6     
  Misses         19       19              
  Partials       13       13              

Flag	Coverage Δ
unittests	96.38% <100.00%> (+0.02%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
taiga/models/__init__.py	100.00% <ø> (ø)
taiga/models/models.py	96.47% <100.00%> (+0.04%)	:arrow_up:

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[yakky]

Fix #122

Fix #123

[yakky]

@gavanfantom thanks a lot for your contribution and sorry for the super late review and merge 😢