Fix empty ALLOW Response header for cls based View

[singulared]

What do these changes do?

Fix empty ALLOW Response header for cls based View

We must check existing lower http method names for assembling
ALLOW header and passing into web.HTTPMethodNotAllowed.

Are there changes in behavior for the user?

yes

Related issue number

No issue

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes

[asvetlov]

Very sorry for late answer but you are asking for ability to write def get() instead of def GET() as I understand.
Why?

[singulared]

Hi! i think lowercase is more pythonic. In other case i did't have valid ALLOW response header if i use def get(). But i can use it as request handler.

[singulared]

Docs use lowercase methods:
http://aiohttp.readthedocs.io/en/stable/web_reference.html#view

[asvetlov]

Ok.
Thanks!

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