feature/161 - Add duplicate() method to Project (#161)

[psybers]

Description

This PR adds a duplicate() method to the Project model, which will duplicate the project on Taiga when called. This causes Taiga to make a new project using the newly specified name/description/is_private/users, but copying the original project's settings, including color names, priorities, etc. It does not duplicate any user stories or tasks.

References

Fix #161

Checklist

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (380660e) 96.49% compared to head (df5c3ab) 96.51%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #163      +/-   ##
==========================================
+ Coverage   96.49%   96.51%   +0.01%     
==========================================
  Files           8        8              
  Lines         914      918       +4     
  Branches       69       69              
==========================================
+ Hits          882      886       +4     
  Misses         19       19              
  Partials       13       13              

Flag	Coverage Δ
unittests	96.51% <100.00%> (+0.01%)	⬆️

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[coveralls]

coverage: 97.93% (+0.009%) from 97.921%
when pulling df5c3ab on psybers:feature/161-add-duplicate
into 380660e on nephila:master.

[protoroto]

@psybers Thank you very much for this! It looks good, I'll have @yakky have a look at it after Christmas to merge and release a new version!

[yakky]

@psybers awesome, thanks a lot 👍