Add `MessageType.guild_invite_reminder`

discord/enums.py

@@ -181,6 +181,7 @@ class MessageType(Enum):
     guild_discovery_grace_period_final_warning   = 17
     reply                                        = 19
     application_command                          = 20
+    guild_invite_reminder                        = 22
 
 class VoiceRegion(Enum):
     us_west       = 'us-west'

discord/message.py

@@ -940,6 +940,9 @@ class Message(Hashable):
         if self.type is MessageType.guild_discovery_grace_period_final_warning:
             return 'This server has failed Discovery activity requirements for 3 weeks in a row. If this server fails for 1 more week, it will be removed from Discovery.'
 
+        if self.type is MessageType.guild_invite_reminder:
+            return 'Wondering who to invite?\nStart by inviting anyone who can help you build the server!'
+
     async def delete(self, *, delay=None):
         """|coro|
 

docs/api.rst

@@ -1069,6 +1069,11 @@ of :class:`enum.Enum`.
 
         The system message denoting that an application (or "slash") command was executed.
 
+        .. versionadded:: 2.0
+    .. attribute:: guild_invite_reminder
+
+        The system message sent as a reminder to invite people to the guild.
+
         .. versionadded:: 2.0
 
 .. class:: ActivityType