Updates the connection count of this node if not already done.

def conns(self, value: Set[str]) -> None:
        """
        Updates the connection count of this node if not already done.
        """
        if not self._conns == value:
            old = self._conns
            self._conns = value
            ins = value - old
            outs = old - value
            logger.display("{}'s connections changed from {} to {}".format(self, old, value))
            self._connsChanged(ins, outs)