Fix test_truesendall failure on MacOS (#289)

Closes: #287

Signed-off-by: Ihar Hrachyshka <[email protected]>

Author: booxter

mocket/socket.py

@@ -158,7 +158,7 @@ def getblocking(self) -> bool:
         return self.gettimeout() is None
 
     def getsockname(self) -> _RetAddress:
-        return true_gethostbyname(self._address[0]), self._address[1]
+        return socket.gethostbyname(self._address[0]), self._address[1]
 
     def connect(self, address: Address) -> None:
         self._address = self._host, self._port = address