fixed service worker caching problem

cookbook/templates/base.html

@@ -216,7 +216,7 @@
     window.addEventListener("load", () => {
         if ("serviceWorker" in navigator) {
             navigator.serviceWorker.register("{% url 'service_worker' %}", { scope: '/' }).then(function (reg) {
-                console.log('Successfully registered service worker', reg);
+
             }).catch(function (err) {
                 console.warn('Error whilst registering service worker', err);
             });