Add group chat functions, slight refactoring

index.js

@@ -0,0 +1,13 @@
+'use strict';
+
+module.exports = {
+    Client: require('./src/Client'),
+    
+    version: require('./package.json').version,
+
+    // Structures
+    Chat: require('./src/structures/Chat'),
+    PrivateChat: require('./src/structures/PrivateChat'),
+    GroupChat: require('./src/structures/GroupChat'),
+    Message: require('./src/structures/Message')
+};