feat(editChannelPositions): add support for endpoint

lib/Client.js

@@ -1328,6 +1328,30 @@ class Client extends EventEmitter {
         })));
     }
 
+    /**
+    * Edit guild channels' positions. Note that channel position numbers are lowest on top and highest at the bottom.
+    * @arg {String} guildID The ID of the guild
+    * @arg {Array<Object>} channelPositions An array of [channel positions](https://discord.com/developers/docs/resources/guild#modify-guild-channel-positions)
+    * @arg {String} channelPositions[].id The ID of the channel
+    * @arg {Number} channelPositions[].position The new position of the channel
+    * @arg {Boolean} [channelPositions[].lockPermissions] Whether to sync the permissions with the new parent if moving to a new category
+    * @arg {String} [channelPositions[].parentID] The new parent ID (category channel) for the channel that is moved (only one channel can change category per request)
+    * @returns {Promise}
+    */
+    editChannelPositions(guildID, channelPositions) {
+        const guild = this.guilds.get(guildID);
+        if(!guild) {
+            return Promise.reject(new Error(`Guild ${guildID} not found`));
+        }
+        channelPositions.forEach((channelPosition) => {
+            const channel = guild.channels.get(channelPosition.id);
+            if(!channel) {
+                return Promise.reject(new Error(`Channel ${channelPosition.id} not found`));
+            }
+        });
+        return this.requestHandler.request("PATCH", Endpoints.GUILD_CHANNELS(guildID), true, channelPositions);
+    }
+
     /**
     * Edit a global application command
     * @arg {String} commandID The command id