IPAddress is missing the toString function interface？

[VirensCn]

Arduino_Core_STM32/cores/arduino/IPAddress.h

Line 84 in 641f3d8

 virtual size_t printTo(Print &p) const; 

IPAddress is missing the toString function interface

[Frederic Pillon]

Hi @VirensCn
Right, not existing when we've introduced this class 7 years ago. 😉
Looking at last implementation even ipv4/ipv6 not added.

Feel free to submit a PR.