Drop support for Go < 1.7: remove gorilla/context

[fharding1]

Remove gorilla/context for reasons outlined in issue #326.

[elithrar]

You’ll need to:

• update travis.yml to remove versions < 1.7
• update documentation to make it clear that clearing the context only applies when using > Go 1.7

[fharding1]

Alright. Also, I'm not sure, but it seems like we can remove contextClear from context_native and the code block from mux.go 158:160. If we did that Router.KeepContext would be basically useless (I think), but removing it would be breaking. Should I just put a comment on it that says this has no effect?

[flibustenet]

Actually gorilla/context is required.
I think it will be more explicit to update go.mod to reflect this now with a require github.com/gorilla/context, then release the last mux that require it and then remove it in this PR.

[elithrar]

@fharding1 Did you want to make the adjustment here as per @flibustenet's comment?

[fharding1]

I'm not sure what he means, why is it required?

[elithrar]

It would provide Module support before the change. I don’t think it’s explicitly required, but I hadn’t seem acknowledgement either way.

…

On Tue, Aug 28, 2018 at 7:18 AM Franklin Harding ***@***.***> wrote: I'm not sure what he means, why is it required? — You are receiving this because you were assigned. Reply to this email directly, view it on GitHub <#391 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AABIcKq7tfJXNlyJiZ29grEXjcU_kwf7ks5uVVEdgaJpZM4VIfhX> .

[fharding1]

I'm not super familiar with modules, but yeah, I don't think it's required. Wasn't planning on addressing that feedback unless @flibustenet can clarify why it's required.

[flibustenet]

I was just thinking of the historical side. We could see it was required and not after. But the changelog is ok also, nothing more...

[elithrar]

Some minor build & filename adjustments required, otherwise a straightforward change!

[elithrar]

Thanks @fharding1