Drop deprecates

[T-256]

Summary

version 1.0 proposal
Resolves requirements for #3069 (review)

Checklist

• I understand that this PR may be closed in case there was no previous discussion. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.

[tomchristie]

Great. Needs a CHANGELOG.md entry.
Once we've got that I think we're good to merge this.

[T-256]

The purpose of this is for v1.0
If next release is not 1.0 then I'd recommend don't merge this soon.

I thought #3069 will include changelogs. For example for this PR:

Removed

• proxies parameter from client.
• data parameter no longer accepts non mapping objects.
• cookies parameter no longer accepts per requests.

@tomchristie Do any docs need to be updated?

[tomchristie]

The purpose of this is for v1.0

My feeling is that we should push on with 1.0.

(Tho I also think that this particular change would be acceptable even in 0.27 release, since it's only removing features that are already formally deprecated.)

[tomchristie]

Neat.

Do any docs need to be updated?

For this PR just the CHANGELOG.md.

[tomchristie]

I'd suggest we limit the pull request to just one line item here, and deal with the proxies case.

[rafalkrupinski]

Please don't remove per-request cookies :)
#2931 - proposition to set domain from the request URL when cookies are passed as a dictionary.

[tomchristie]

Targeting just the proxies=... change is the thing to do here.
Let's keep PRs sharply targeted. 🎯

[T-256]

I ended up to not drop any public api before major release.
So, closing this for now.