Add headers to ClientSession.ws_connect.

[Rapptz]

The documentation says bare aiohttp.ws_connect is deprecated and ClientSession.ws_connect should be used instead.

However, the latter has less features than the former. ClientSession.ws_connect does not have the headers keyword argument to allow us to add any headers we want while aiohttp.ws_connect does.

[asvetlov]

Does session headers satisfy your requirements or do you need temporary headers specific to ws_connect request?

[Rapptz]

The latter. Some headers can be global, e.g. I set the content type in the Session headers but the ws_connect does not need them.

[asvetlov]

That makes sense. Would you provide a Pull Request?

[asvetlov]

Fixed by #898

[lock]

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