Set a project's avatar.

        :param project: ID or key of the project to set the avatar on
        :param avatar: ID of the avatar to set

def set_project_avatar(self, project, avatar):
        """Set a project's avatar.

        :param project: ID or key of the project to set the avatar on
        :param avatar: ID of the avatar to set
        """
        self._set_avatar(
            None, self._get_url('project/' + project + '/avatar'), avatar)