chore: Measure code coverage

[robinlinden]

See https://codecov.io/gh/robinlinden/bTox/tree/e25e102ac83df22e9aac206604f3cf10035633cd/lib for a successful run.

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This change is 

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[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@a65f539). Click here to learn what that means. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #27   +/-   ##
=========================================
  Coverage          ?   41.17%           
=========================================
  Files             ?        7           
  Lines             ?      221           
  Branches          ?        0           
=========================================
  Hits              ?       91           
  Misses            ?      130           
  Partials          ?        0           

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