'This works similar to :meth:`render` but returns a coroutine
that when awaited returns the entire rendered template string.  This
requires the async feature to be enabled.
Example usage::
await template.render_async(knights=\'that say nih; asynchronously\')'

def render_async(self, *args, **kwargs):

    raise NotImplementedError('This    feature    is    not    available    for    this    version    of    Python')
