Check if user is being watched by the given user

        :param username: Check if username is watching you

def is_watching(self, username):

        """Check if user is being watched by the given user

        :param username: Check if username is watching you
        """

        if self.standard_grant_type is not "authorization_code":
            raise DeviantartError("Authentication through Authorization Code (Grant Type) is required in order to connect to this endpoint.")

        response = self._req('/user/friends/watching/{}'.format(username))

        return response['watching']