Add codecov badge

[vil02]

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Describe your change:

Continuation of #1599 - simply adds a codecov badge.

• Documentation change?

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1d63400) 81.55% compared to head (963fb75) 81.55%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1600   +/-   ##
=======================================
  Coverage   81.55%   81.55%           
=======================================
  Files         377      377           
  Lines       19747    19747           
  Branches     2865     2865           
=======================================
  Hits        16105    16105           
  Misses       3642     3642           

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