Add support for AuditLogDiff.slowmode_delay.

docs/api.rst

@@ -572,22 +572,22 @@ Application Info
 
         The owner of the application. This is a :class:`User` instance
         with the owner's information at the time of the call.
-        
+
     .. attribute:: bot_public
-    
+
         ``True`` if the bot is considered as public, else ``False``.
         Determines if the bot can be invited by anyone or if it is locked
         to the token owner. Correspond to the "Public bot" box in the
         token settings.
-        
+
     .. attribute:: bot_require_code_grant
-    
+
         ``True`` if the bot requires code grant, else ``False``.
         Correspond to the "Bot requires code grant" box in the token
         settings.
-        
+
     .. attribute:: rpc_origins
-    
+
         Returns an array of RPC origin URL strings, if RPC is enabled.
         If RPC isn't enabled, returns ``None``.
 
@@ -1741,6 +1741,13 @@ this goal, it must make use of a couple of data classes that aid in this goal.
 
         See also :attr:`User.avatar`.
 
+    .. attribute:: slowmode_delay
+
+        :class:`int` – The number of seconds members have to wait before
+        sending another message in the channel.
+
+        See also :attr:`TextChannel.slowmode_delay`.
+
 .. this is currently missing the following keys: reason and application_id
    I'm not sure how to about porting these