Follow a user.

        :param user_id: ID of the user in question
        :param notify: whether to notify the user about the following
        :return: user that are followed

def follow(self, user_id, notify=False):
        """
        Follow a user.

        :param user_id: ID of the user in question
        :param notify: whether to notify the user about the following
        :return: user that are followed
        """
        try:
            return User(self._client.create_friendship(user_id=user_id, follow=notify)._json)
        except TweepError as e:
            if e.api_code in [TWITTER_ACCOUNT_SUSPENDED_ERROR]:
                return self.get_user(user_id)
            raise