This adds https://github.com/matrix-org/matrix-doc/pull/2409 to the appservice registrations, enabling synapse to push EDUs to appservices.
Fixes a regression introduced in f6097fbba1, which was cauing Synapse to die with this error message: > ValueError: sender_localpart needs characters which are not URL encoded.
f6097fbba1
Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/806