Merge branch 'v5' into 'master'

feat: support room version 5

See merge request famedly/conduit!138

src/client_server/room.rs

@@ -373,7 +373,10 @@ pub async fn upgrade_room_route(
 ) -> ConduitResult<upgrade_room::Response> {
     let sender_user = body.sender_user.as_ref().expect("user is authenticated");
 
-    if !matches!(body.new_version, RoomVersionId::Version6) {
+    if !matches!(
+        body.new_version,
+        RoomVersionId::Version5 | RoomVersionId::Version6
+    ) {
         return Err(Error::BadRequest(
             ErrorKind::UnsupportedRoomVersion,
             "This server does not support that room version.",