No conversion needed before calling PushManager.subscribe() (#663)

Fixes #662

Author: shahata

README.md

@@ -60,32 +60,13 @@ webpush.sendNotification(pushSubscription, 'Your Push Payload Text');
 
 ## Using VAPID Key for applicationServerKey
 
-When using your VAPID key in your web app, you'll need to convert the
-URL safe base64 string to a Uint8Array to pass into the subscribe call,
+When subscribing to push messages, you'll need to pass your VAPID key,
 which you can do like so:
 
 ```javascript
-function urlBase64ToUint8Array(base64String) {
-  const padding = '='.repeat((4 - base64String.length % 4) % 4);
-  const base64 = (base64String + padding)
-    .replace(/-/g, '+')
-    .replace(/_/g, '/');
-
-  const rawData = window.atob(base64);
-  const outputArray = new Uint8Array(rawData.length);
-
-  for (let i = 0; i < rawData.length; ++i) {
-    outputArray[i] = rawData.charCodeAt(i);
-  }
-  return outputArray;
-}
-
-const vapidPublicKey = '<Your Public Key from generateVAPIDKeys()>';
-const convertedVapidKey = urlBase64ToUint8Array(vapidPublicKey);
-
 registration.pushManager.subscribe({
   userVisibleOnly: true,
-  applicationServerKey: convertedVapidKey
+  applicationServerKey: '<Your Public Key from generateVAPIDKeys()>'
 });
 ```