Merge pull request #3034 from matrix-org/johannes/poll-start-sent-receipt

Make poll start event type available (PSG-962)

Author: andybalaam

src/@types/event.ts

@@ -66,6 +66,7 @@ export enum EventType {
     // use of this is discouraged https://matrix.org/docs/spec/client_server/r0.6.1#m-room-message-feedback
     RoomMessageFeedback = "m.room.message.feedback",
     Reaction = "m.reaction",
+    PollStart = "org.matrix.msc3381.poll.start",
 
     // Room ephemeral events
     Typing = "m.typing",