Log Message:
nghttp2: updated to 1.29.0

nghttp2 v1.29.0:
lib
* NGHTTP2_REFUSED_STREAM is now used as an error code passed to \ 
nghttp2_on_stream_close_callback for streams which are closed by GOAWAY to \ 
indicate that they are safely retried.

build
* SPDY related code was completely removed.

nghttpx
* The commit which breaks load balancing among HTTP/2 backend in some situations \ 
has been reverted.
* The default value of --api-max-request-body option has been increased to 32MiB.
* The time to load the large number of backend options has been greatly improved.
* The crash with --backend-http-proxy-uri option has been fixed.