Update README.md

Author: TalAter

README.md

@@ -61,7 +61,7 @@ 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 in to a Uint8Array to pass into the subscribe call,
+URL safe base64 string to a Uint8Array to pass into the subscribe call,
 which you can do like so:
 
 ```javascript