Delete the Mxit user's avatar
        User authentication required with the following scope: 'avatar/write'

def delete_avatar(self, scope='avatar/write'):
        """
        Delete the Mxit user's avatar
        User authentication required with the following scope: 'avatar/write'
        """
        return _delete(
            token=self.oauth.get_user_token(scope),
            uri='/user/avatar'
        )