[channels] add ability to modify properties on channel

disco/types/channel.py

@@ -381,6 +381,38 @@ class Channel(SlottedModel, Permissible):
         assert self.is_dm, 'Cannot close non-DM channel'
         self.delete()
 
+    def set_topic(self, topic, reason=None):
+        """
+        Sets the channels topic.
+        """
+        return self.client.api.channels_modify(self.id, topic=topic, reason=reason)
+
+    def set_name(self, name, reason=None):
+        """
+        Sets the channels name.
+        """
+        return self.client.api.channels_modify(self.id, name=name, reason=reason)
+
+    def set_position(self, position, reason=None):
+        """
+        Sets the channels position.
+        """
+        return self.client.api.channels_modify(self.id, position=position, reason=reason)
+
+    def set_bitrate(self, bitrate, reason=None):
+        """
+        Sets the channels bitrate.
+        """
+        assert (self.is_voice)
+        return self.client.api.channels_modify(self.id, bitrate=bitrate, reason=reason)
+
+    def set_user_limit(self, user_limit, reason=None):
+        """
+        Sets the channels user limit.
+        """
+        assert (self.is_voice)
+        return self.client.api.channels_modify(self.id, user_limit=user_limit, reason=reason)
+
 
 class MessageIterator(object):
     """