Update Developer Resources: Service Worker

#1

Niggly thing but JS breaks if not corrected.
Change this.

.then(function(){
  console.log('Service worker is ready, and assets are cached');
});

);

To this.

.then(function(){
  console.log('Service worker is ready, and assets are cached');
}));

Or better…
.then(() => {
console.log(‘Service worker is ready, and assets are cached’);
}));