Log Message:
nghttp2: updated to 1.30.0

1.30.0:
lib:
This release fixes the bug so that PING frame can be sent after GOAWAY.

nghttpx:
This release fixes the bug that set_header method in mruby script wrongly \ 
overwrites other header fields.

upgrade-scheme parameter has been added to backend option to workaround the \ 
issue that a backend server requires that HTTP/2 :scheme pseudo header field \ 
value should be https.

This release fixes the bug that ALPN validation does not occur if client does \ 
not send TLS ALPN extension.

To more compliant to RFC 8297, nghttpx now remembers which resource is pushed \ 
per a single request.