Including exponent in Minkowski cost

[NicolaCourtier]

Description

Updating the definition of the Minkowski cost to include the exponent of 1/p.

Issue reference

Partly fixes #382.

Review

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• Updated the CHANGELOG.md in reverse chronological order (newest at the top) with a concise description of the changes, including the PR number.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.08%. Comparing base (09be74c) to head (73f5477).

Additional details and impacted files

@@               Coverage Diff               @@
##           minkowski-cost     #407   +/-   ##
===============================================
  Coverage           98.08%   98.08%           
===============================================
  Files                  43       43           
  Lines                2607     2610    +3     
===============================================
+ Hits                 2557     2560    +3     
  Misses                 50       50           

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[BradyPlanden]

Thanks for the additions @NicolaCourtier