IPAddress: add toString() method

[pennam]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.06 🎉

Comparison is base (844e4bf) 95.70% compared to head (1a4a7f8) 95.76%.

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              

Impacted Files	Coverage Δ
api/IPAddress.h	100.00% <ø> (ø)
api/IPAddress.cpp	94.87% <100.00%> (+0.39%)	⬆️

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