aiohttp 3.3.0 release

The main change is introducing new client timeouts.

The release has many new improvements and bugfixes as well.

Changes

Features

• Raise ConnectionResetError instead of CancelledError on trying to
  write to a closed stream. #2499
• Implement ClientTimeout class and support socket read timeout. #2768
• Enable logging when aiohttp.web is used as a program #2956
• Add canonical property to resources #2968
• Forbid reading response BODY after release #2983
• Implement base protocol class to avoid a dependency from internal
  asyncio.streams.FlowControlMixin #2986
• Cythonize @helpers.reify, 5% boost on macro benchmark #2995
• Optimize HTTP parser #3015
• Implement runner.addresses property. #3036
• Use bytearray instead of a list of bytes in websocket reader. It
  improves websocket message reading a little. #3039
• Remove heartbeat on closing connection on keepalive timeout. The used hack
  violates HTTP protocol. #3041
• Limit websocket message size on reading to 4 MB by default. #3045

Bugfixes

• Don't reuse a connection with the same URL but different proxy/TLS settings
  #2981
• When parsing the Forwarded header, the optional port number is now preserved.
  #3009

Improved Documentation

• Make Change Log more visible in docs #3029
• Make style and grammar improvements on the FAQ page. #3030- Document that signal handlers should be async functions since aiohttp 3.0
  #3032

Deprecations and Removals

• Deprecate custom application's router. #3021