add update url

Author: 7nik

src/meta.user.js

@@ -5,6 +5,7 @@
 // @description  Adds a calculator to google home page
 // @homepageURL  https://github.com/7nik/test-svelte-userscript
 // @supportURL   https://github.com/7nik/test-svelte-userscript/issues
+// @updateURL    https://github.com/7nik/test-svelte-userscript/releases/latest/download/userscript.meta.js
 // @downloadURL  https://github.com/7nik/test-svelte-userscript/releases/latest/download/userscript.user.js
 // @author       7nik
 // @match        https://www.google.com/