Remove EXPOSE_HEADER option

[rpep]

Match functionality from https://github.com/snok/asgi-correlation-id and remove EXPOSE_HEADER

[JonasKs]

Some tests still fail 😊 I'd also love some docs on how to configure CORS😊

[rpep]

@JonasKs think that's alright now and have added the CORS documentation. I've had a look at failing tests and seems to be unrelated - they're currently failing to get past the install stage due to this:

Any ideas?

[JonasKs]

Thanks for the PR 😊

Huh, weird. I'll have to look, but I'm away for a week or so now.

[rpep]

@JonasKs no worries at all. Give me a ping if you need me to try anything when you’re back :)

[JonasKs]

Hi @rpep , I'm sorry for forgetting about this. I've been keeping this library on life-support for a few years now, but I'm happy to accept any contribution and add maintainers.

I'm happy to merge this now, if you guys are (@sondrelg?). Should probably also do a major version bump?

[sondrelg]

I think this looks good 👍 Added a few things that'd be nice to implement before a major bump in #86, but some might be outdated and some might not be necessary