Add support for AuditLogDiff.slowmode_delay.

discord/audit_logs.py

@@ -111,6 +111,7 @@ class AuditLogChanges:
         'splash_hash':             ('splash', None),
         'icon_hash':               ('icon', None),
         'avatar_hash':             ('avatar', None),
+        'rate_limit_per_user':     ('slowmode_delay', None),
     }
 
     def __init__(self, entry, data):

docs/api.rst

@@ -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