[Twisted-web] Add response logging to logging-proxy.py example

[Alexei Colin]

Hello,

The example logging-proxy.py processes the request, but not the
response. Yes, one can learn how to do that from the docs and from
stackoverflow, but that is an avoidable time burden. Sometimes this
example is all one needs, if only it were complete with both directions.

Could the example be revised or new one added with something like the
attached? Thank you for the consideration.

-alexei
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