[w3c/manifest] MIME type in HTML <link type="application/manifest+json" rel="manifest"> (#721)

Currently a WebApp manifest is discoverable using the HTML `<link>` header:
```html
<link rel="manifest"/>
```
I've come across the [Readium Web Publication Manifest](https://github.com/readium/webpub-manifest) which _« is an attempt to standardize a JSON based manifest format »_ for collections discovery, in the context of [WebPublications](https://www.w3.org/TR/wpub/) - noting that currently _« [The precise format of how such a manifest is stored is not considered in this document. ](https://w3c.github.io/dpub-pwp-ucr/#terminology) »_

To make such collections discoverable, Readium proposes the following HTML `<link>` header:
```html
<link href="manifest.json" rel="manifest" type="application/webpub+json">
```
While writing a parser for HTML `<meta>` and `<link>` tags, I'm now wondering how I should handle those cases.

Which brings me to asking, shouldn't the MIME type `application/manifest+json` be explicitly added in the HTML `<link>` element to make it clearly distinguishable, unequivocal ?
```html
<link type="application/manifest+json" rel="manifest">
```


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