Deprecate bare request(), get() and family for encouraging ClientSession usage

[asvetlov]

Recreating Connector on every request is a little expensive.
ClientSession allows connection utilization, it also supports keep-alives out-of-the box.

Unfortunately I see many examples of bare coroutines usage -- people are lazy :(

[gwillem]

Hi Andrew! IMHO most people will follow the basic examples without reading everything. Upper half of http://aiohttp.readthedocs.org/en/stable/client.html does not mention connectors.

Then again, people who care for performance are probably also the ones who do read the reference doc.

[asvetlov]

Would you update docs to emphasize ClientSession usage?

[asvetlov]

Fixed by e194ede and e8b47f7

[lock]

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