IPAddress: add toString() method

[pennam]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.76%. Comparing base (844e4bf) to head (1a4a7f8).
Report is 90 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #187      +/-   ##
==========================================
+ Coverage   95.70%   95.76%   +0.06%     
==========================================
  Files          13       13              
  Lines         954      968      +14     
==========================================
+ Hits          913      927      +14     
  Misses         41       41              

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