Updates an existing post.
        When the `markdown` property is present, it will be
        automatically converted to `mobiledoc` on v1.+ of the server.

        :param id: The ID of the existing post
        :param kwargs: The properties of the post to change
        :return: The updated `Post` object

def update(self, id, **kwargs):
        """
        Updates an existing post.
        When the `markdown` property is present, it will be
        automatically converted to `mobiledoc` on v1.+ of the server.

        :param id: The ID of the existing post
        :param kwargs: The properties of the post to change
        :return: The updated `Post` object
        """

        return super(PostController, self).update(id, **self._with_markdown(kwargs))