message: Fix PHP7.1 compatibility
diff: @@ -1379,7 +1379,7 @@ static PHP_METHOD(swoole_socket_coro, getsockname)
  }
  array_init(return_value);
  - add_assoc_string(return_value, "address", sock->socket->get_ip());
  + add_assoc_string(return_value, "address", (char *) sock->socket->get_ip());
  add_assoc_long(return_value, "port", sock->socket->get_port());
  }
  @@ -1394,7 +1394,7 @@ static PHP_METHOD(swoole_socket_coro, getpeername)
  }
  array_init(return_value);
  - add_assoc_string(return_value, "address", sock->socket->get_ip());
  + add_assoc_string(return_value, "address", (char *) sock->socket->get_ip());
  add_assoc_long(return_value, "port", sock->socket->get_port());
  }
  