nghttp2: bump to 1.37.0

nghttp2: bump to 1.37.0

cfb47d30 Take into account larger frame size for prioritization
dbbe4e01 Remove unused field
371bc3a8 clang-format
5e7889c5 Update manual pages
b1b2ad50 Bump up version number to 1.37.0, LT revision to 31:2:17
e043ca83 Update AUTHORS
c2434dfb Simplify stream_less
816ad210 Reuse name when indexing header by referencing dynamic table
f5feb16e Merge pull request #1295 from bratkartoffel/fix-compile-boringssl
adf09f21 Merge pull request #1303 from donny-dont/fix-shared-install
2591960e Explicitly set install location when building shared libs
d93842db nghttpx: Fix backend stall if header and request body are sent in 2 packets
8dc2b263 nghttpx: Use std::priority_queue
8d842701 Update manual pages
de85b0fd Update README
5d6beed5 Merge branch 'nghttpx-backend-weight'
1ff9de4c nghttpx: Backend address selection with weight
34482ed4 Fix compilation with boringssl
9b6ced66 Bump up version number to 1.37.0-DEV

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>