Running on vis. std. 2017

[firatsarlar]

Hello,
First of all , thanks for this nice lib.
I was trying to compile on win 10 , vis. std. 2017, and getting unresolved external errors.
After some digging I realize that
#pragma comment(lib, "ws2_32.lib")
line should be added (i added it in #ifdef _win32 definition )

This needed for both client and server examples.

Best regards,