def handle_stream_features(self, stream, features):
<EOL>return False<EOL>
Handle features announced by the stream peer.

        [initiator only]

        :Parameters:
            - `stream`: the stream
            - `features`: the features element just received
        :Types:
            - `stream`: `StreamBase`
            - `features`: :etree:`ElementTree.Element`

        :Return:
            - `StreamFeatureHandled` instance if a feature was recognized and
              handled
            - `StreamFeatureNotHandled` instance if a feature was recognized
              but not handled
            - `None` if no feature was recognized