Add group chat functions, slight refactoring

src/structures/Chat.js

@@ -0,0 +1,33 @@
+'use strict';
+
+const Base = require('./Base');
+
+/**
+ * Represents a Chat on WhatsApp
+ * @extends {Base}
+ */
+class Chat extends Base {
+    constructor(client, data) {
+        super(client);
+
+        if(data) this._patch(data);
+    }
+
+    _patch(data) {
+        this.id = data.id;
+
+        this.name = data.formattedTitle;
+        this.isGroup = data.isGroup;
+        this.isReadOnly = data.isReadOnly;
+        this.unreadCount = data.unreadCount;
+        this.timestamp = data.t;
+
+        return super._patch(data);
+    }
+
+    sendMessage(message) {
+        return this.client.sendMessage(this.id._serialized, message);
+    }
+}
+
+module.exports = Chat;