useWasm hook

The 4th of february react@16.8.0 will be released, and it will contains hooks: facebook/react#14692.
This means that we can develop a `useWasm` hook, as said in #1, a new alternative to the render prop and HoC. Maybe something like:

```js
const { loading, error, data } = useWasm({
  url: '/add.wasm'
});
```

@mfrachet let me know if you are interested in developing this 😄 