[w3c/manifest] ServiceWorker type-member ( "type" : "module" ) (#594)

Maybe we should add a "type" member for "service_workers"?

```
...
"serviceworker": { 
    "src": "sw.js", 
    "scope": "/racer/", 
    "use_cache": false 
    "type": "module" 
},
...
```

Will be needed once Browsers support serviceWorkers as js-modules.
https://html.spec.whatwg.org/#module-worker-example

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