I think I got ChannelUpdate working??

src/client/actions/ChannelUpdate.js

@@ -0,0 +1,39 @@
+'use strict';
+
+const Action = require('./Action');
+const Constants = require('../../util/Constants');
+const CloneObject = require('../../util/CloneObject');
+const Message = require('../../structures/Message');
+
+class ChannelUpdateAction extends Action {
+
+	constructor(client) {
+		super(client);
+	}
+
+	handle(data) {
+
+		let client = this.client;
+		let channel = client.store.get('channels', data.id);
+
+		if (channel) {
+			let oldChannel = CloneObject(channel);
+			channel.setup(data);
+			if (!oldChannel.equals(data)) {
+				client.emit(Constants.Events.CHANNEL_UPDATE, oldChannel, channel);
+			}
+
+			return {
+				old: oldChannel,
+				updated: channel,
+			};
+		}
+
+		return {
+			old: null,
+			updated: null,
+		};
+	}
+};
+
+module.exports = ChannelUpdateAction;