Re: [manifest] How does updating work? (#384)

Note that I just saw this on theguardian.com
```
<link rel="manifest" href="/2015-06-24-manifest.json" crossorigin="use-credentials">
```
That manifest URL does not look like it's designed to be static to me! How can we better communicate to developers that the manifest URL should not change, otherwise they will not be able to update their manifest (e.g. change their icon) for users who have already installed their app?

Also, the use of crossorigin="use-credentials" is interesting.

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