Add 'sort' parameter to keypaths()

[kotfu]

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name: Pull request
about: Submit a pull request for this project
assignees: fabiocaccamo

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Describe your changes
The keypaths() function sorts the list before returning it. There are use cases where an unsorted list is useful. Added a sort parameter which defaults to True for backwards compatability. Added unit test, and updated README. This PR based on a patch from @mucmch.

Related issue
#404.

Checklist before requesting a review

• I have performed a self-review of my code.
• I have added tests for the proposed changes.
• I have run the tests and there are not errors.

I also updated the documentation in README.md to show this new parameter.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.76%. Comparing base (58f62a5) to head (6611152).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #467   +/-   ##
=======================================
  Coverage   97.76%   97.76%           
=======================================
  Files          63       63           
  Lines        2011     2012    +1     
=======================================
+ Hits         1966     1967    +1     
  Misses         45       45           

Flag	Coverage Δ
unittests	97.76% <100.00%> (+<0.01%)	⬆️

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[fabiocaccamo]

@kotfu thank you for this nice PR!