Added "any" method and fixed `res.write()`

[Saiv46]

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1. Added "any" field Many web frameworks allowing you to match all HTTP methods. https://expressjs.com/en/4x/api.html#app.all for example.

2. See https://nodejs.org/api/http.html#http_response_write_chunk_encoding_callback res.write() must return boolean, but it doesn't because data got intercepted.

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Tests

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[benmccann]

Can you update the documentation in https://github.com/sveltejs/sapper/blob/master/site/content/docs/02-routing.md#server-routes ?

[thgh]

Could we change any to default so it's aligned with Next.js? (Next.js only has export default which acts as any)

[benmccann]

Sorry this had gone unreviewed for so long. It looks like there's a merge conflict here. Maybe it's better to try to make sure SvelteKit works as desired than trying to get it in here at this point?

[benmccann]

SvelteKit 1.0 is now out and Sapper is deprecated, so I'm going to close this