Add codeowners

[tommystendahl]

Related to #614

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (43b9a39) 77.42% compared to head (aaa0793) 77.29%.
Report is 5 commits behind head on ecchronos-1.0.

Files	Patch %	Lines
...assandra/ecchronos/core/repair/TableRepairJob.java	50.00%	3 Missing ⚠️
...sandra/ecchronos/fm/impl/LoggingFaultReporter.java	66.66%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@                 Coverage Diff                 @@
##             ecchronos-1.0     #626      +/-   ##
===================================================
- Coverage            77.42%   77.29%   -0.13%     
- Complexity             565      569       +4     
===================================================
  Files                   71       71              
  Lines                 2423     2427       +4     
  Branches               248      249       +1     
===================================================
  Hits                  1876     1876              
- Misses                 473      476       +3     
- Partials                74       75       +1     

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