generate code coverage in a format compatible with Codecov

[haarg]

Codecov doesn't understand the JSON format generated by Devel::Cover. Use the Codecovbash report plugin to generate a suitable file.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.80%. Comparing base (5691cb1) to head (67adff6).
Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1385       +/-   ##
===========================================
+ Coverage        0   59.80%   +59.80%     
===========================================
  Files           0      135      +135     
  Lines           0     4403     +4403     
  Branches        0      673      +673     
===========================================
+ Hits            0     2633     +2633     
- Misses          0     1516     +1516     
- Partials        0      254      +254     

see 135 files with indirect coverage changes

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