Changelog:
===========
-Fixed importing aiohttp under PyPy on Windows.
-Fixed async concurrency safety in websocket compressor.
-Fixed ClientResponse.close() releasing the connection instead of closing.
-Fixed a regression where connection may get closed during upgrade.
-Fixed messages being reported as upgraded without an Upgrade header in Python parser.
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
