Cannot have multiple response headers w/ same name about burp-awesome-tls

[AlecHaring]

It seems like even after your fix, this issue is still not fully fixed. res.Header.Get(k) only returns the first value of the given key. I'll open a PR with a fix

[sleeyax]

Good catch, thanks. We can't do something like res.Header.Write(w) because that would write the headers to the body instead of actually setting the HTTP headers in the response. Or what did you have in mind to shorten this, exactly? Suggestions are welcome.

[sleeyax]

Replaced Set with Add. Though if you have another approach/improvement, let me know or create a PR to include it in the next release.

[AlecHaring]

Or what did you have in mind to shorten this, exactly?

I was thinking we could call res.Header.Clone() and then swap the instance of the ResponseWriter w/ the cloned Header, but it does not look like there's a clean way to do it

[sleeyax]

Closed in #18