This is a new release for 1.6 series, including bug fixes and a security fix.

• [security fix][redirect] uri-escape the user-supplied portion of the redirect path (CVE-2016-1133) #682 #684 (Kazuho Oku)
• [core] fix error when trying to set multiple error documents using one error-doc directive #676 (Yamagishi Kazutoshi)
• [file] fix a bug that incorrectly returns 403 when a file is requested with a trailing slash #686 (Yamagishi Kazutoshi)
• [http2] fix HPACK encoder error (and crash) when trying to encode a token wo. hpack index #640 (Kazuho Oku)
• [libh2o] fix race condition during multithread receiver (un)registration #659 (Chul-Woong Yang)
• [libh2o] fix memory leak on dispose #683 (Kazuho Oku)