Change ClientResponse.url to yarl.URL instance

[fafhrd91]

Deprecate ClientResponse.url_obj attribute

[fafhrd91]

done

[asvetlov]

@fafhrd91 I should say again: you are running too fast in dropping deprecated code.
url_obj was introduced in aiohttp 1.1 which was released 2016-11-03
The change is 4 months only!
I suspect that many your changes suffer from similar problems.

P.S. I highly respect your contribution but please don't be so aggressive in dropping old styled API.
P.P.S. I would review the changes before next release. Have no time for it at weekend but I promise to spend a couple hours per day at least starting from next week.

[fafhrd91]

I was careful about api compatibility. But I am bullish about url_obj, it is so ugly. Also it is not big change, just replacing resp.url with str(resp.url). We have this opportunity with 2.0, I do not know when we get another version bump. Also I don't think people read deprecation warnings

[fafhrd91]

changed in master

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