chore(addon): 新增wechat插件

src/addon/wechat/event/UnInstall.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace addon\Wechat\event;
+
+/**
+ * 应用卸载
+ */
+class UnInstall
+{
+    /**
+     * 执行卸载
+     */
+    public function handle()
+    {
+        return error('', 'System addon can not be uninstalled！');
+    }
+}