[Closes #59] Add code coverage reporting to codecov

[lauratpa]

Closes #59

Checklist

• [x] I have made a material change to the repo (functionality, testing, spelling, grammar)
• [x] I have read the [Contribution Guide] and my PR follows them.
• [x] I updated my branch with the master branch.
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation about the functionality in the appropriate .md file
• [ ] I have added in line documentation to the code I modified

Short description of what this PR does:

This PR add code coverage reporting and integrates it with codecov

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@078a50f). Click here to learn what that means. The diff coverage is 100%.

@@            Coverage Diff            @@
##             master      #60   +/-   ##
=========================================
  Coverage          ?   91.62%           
=========================================
  Files             ?        2           
  Lines             ?      179           
  Branches          ?        0           
=========================================
  Hits              ?      164           
  Misses            ?       15           
  Partials          ?        0

Impacted Files	Coverage Δ
test/test_ruby_http_client.rb	95.14% <100%> (ø)

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[thinkingserious]

Hello @jekuta,

Was there a problem with this PR? Thanks!

With Best Regards,

Elmer