Switch 'isparta' to 'nyc' and 'coveralls' to 'codecov'

[IvanGoncharov]

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@e07735f). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #258   +/-   ##
=========================================
  Coverage          ?   99.51%           
=========================================
  Files             ?       19           
  Lines             ?      621           
  Branches          ?       36           
=========================================
  Hits              ?      618           
  Misses            ?        3           
  Partials          ?        0           

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