remove testing method from script file

lib/public/scripts.js

@@ -199,7 +199,6 @@
       }).catch(reject)
     })
   }
-  window.postURL = postURL
 
   const form = document.querySelector('form')
   const submitButton = document.querySelector("#submit")

lib/public/service-worker.js

@@ -1,4 +1,4 @@
-// Worker v7
+// Worker v8
 
 self.addEventListener('install', (event) => {
   event.waitUntil(
@@ -6,7 +6,7 @@ self.addEventListener('install', (event) => {
       return cache.addAll([
         '/',
         '/favicon.ico',
-        '/scripts.js?3',
+        '/scripts.js?4',
         '/style.css?5',
         '/about?2',
         '/icon-512.png',

lib/views/index.ejs

@@ -79,6 +79,6 @@
       <a href="/about" target="_blank" title="About the project">About</about>
     </footer>
 
-    <script src="/scripts.js?3"></script>
+    <script src="/scripts.js?4"></script>
   </body>
 </html>