Changes with nginx 1.9.6 27 Oct 2015
*) Bugfix: a segmentation fault might occur in a worker process when using HTTP/2. Thanks to Piotr Sikora and Denis Andzakovic.
*) Bugfix: the $server_protocol variable was empty when using HTTP/2.
*) Bugfix: backend SSL connections in the stream module might be timed out unexpectedly.
*) Bugfix: a segmentation fault might occur in a worker process if different ssl_session_cache settings were used in different virtual servers.
*) Bugfix: nginx/Windows could not be built with MinGW gcc; the bug had appeared in 1.9.4. Thanks to Kouhei Sutou.
*) Bugfix: time was not updated when the timer_resolution directive was used on Windows.
*) Miscellaneous minor fixes and improvements. Thanks to Markus Linnala, Kurtis Nusbaum and Piotr Sikora.