by default include m.room.encryption on invites (#3902)

* by default include m.room.encryption on invites

* fix constant

* changelog

changelog.d/3902.feature

@@ -0,0 +1 @@
+Include m.room.encryption on invites by default

synapse/api/constants.py

@@ -73,6 +73,7 @@ class EventTypes(object):
     RoomHistoryVisibility = "m.room.history_visibility"
     CanonicalAlias = "m.room.canonical_alias"
     RoomAvatar = "m.room.avatar"
+    RoomEncryption = "m.room.encryption"
     GuestAccess = "m.room.guest_access"
 
     # These are used for validation

synapse/config/api.py

@@ -24,6 +24,7 @@ class ApiConfig(Config):
             EventTypes.JoinRules,
             EventTypes.CanonicalAlias,
             EventTypes.RoomAvatar,
+            EventTypes.RoomEncryption,
             EventTypes.Name,
         ])
 
@@ -36,5 +37,6 @@ class ApiConfig(Config):
             - "{JoinRules}"
             - "{CanonicalAlias}"
             - "{RoomAvatar}"
+            - "{RoomEncryption}"
             - "{Name}"
         """.format(**vars(EventTypes))