feat(client): Add support for PTR DNS records

[d7415]

Summary

This just adds PTR to the supported DNS record types.

Checklist

• Tested and/or added tests to validate that the changes work as intended, if applicable.
• Updated documentation in README.md, if applicable.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.50%. Comparing base (52a7312) to head (454736f).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #886      +/-   ##
==========================================
+ Coverage   77.49%   77.50%   +0.01%     
==========================================
  Files          72       72              
  Lines        5802     5806       +4     
==========================================
+ Hits         4496     4500       +4     
  Misses       1089     1089              
  Partials      217      217              

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