Add CHANNEL_FOLLOW_ADD Message Type

Add documentation for MessageType.channel_follow_add

Add versionchanged to new MessageType attr

Add system_content for new MessageType

discord/enums.py

@@ -171,6 +171,7 @@ class MessageType(Enum):
     premium_guild_tier_1       = 9
     premium_guild_tier_2       = 10
     premium_guild_tier_3       = 11
+    channel_follow_add         = 12
 
 class VoiceRegion(Enum):
     us_west       = 'us-west'

discord/message.py

@@ -669,6 +669,9 @@ class Message:
         if self.type is MessageType.premium_guild_tier_3:
             return '{0.author.name} just boosted the server! {0.guild} has achieved **Level 3!**'.format(self)
 
+        if self.type is MessageType.channel_follow_add:
+            return '{0.author.name} has added {0.content} to this channel'.format(self)
+
     async def delete(self, *, delay=None):
         """|coro|
 

docs/api.rst

@@ -760,6 +760,9 @@ of :class:`enum.Enum`.
     Specifies the type of :class:`Message`. This is used to denote if a message
     is to be interpreted as a system message or a regular message.
 
+    .. versionchanged:: 1.3.0
+        The ``channel_follow_add`` attribute was added.
+
     .. attribute:: default
 
         The default message type. This is the same as regular messages.
@@ -803,6 +806,9 @@ of :class:`enum.Enum`.
 
         The system message denoting that a member has "nitro boosted" a guild
         and it achieved level 3.
+    .. attribute:: channel_follow_add
+
+        The system message denoting that an announcement channel has been followed.
 
 .. class:: ActivityType