nghttp2: update to 1.38.0

www/nghttp2/Portfile

@@ -6,7 +6,7 @@ PortGroup           cxx11 1.1
 PortGroup           github 1.0
 PortGroup           legacysupport 1.0
 
-github.setup        tatsuhiro-t nghttp2 1.37.0 v
+github.setup        tatsuhiro-t nghttp2 1.38.0 v
 revision            0
 categories          www
 platforms           darwin
@@ -21,9 +21,9 @@ long_description    ${description} Included are a HTTP/2 client, server and prox
 github.tarball_from releases
 use_xz              yes
 
-checksums           rmd160  6743620cb9e0001b4ba8401cb744cd544a9f70c9 \
-                    sha256  aa090b164b17f4b91fe32310a1c0edf3e97e02cd9d1524eef42d60dd1e8d47b7 \
-                    size    1628248
+checksums           rmd160  887ea354383fa461d5c1fa18560d44288c0561c0 \
+                    sha256  ef75c761858241c6b4372fa6397aa0481a984b84b7b07c4ec7dc2d7b9eee87f8 \
+                    size    1628356
 
 # nghttp2 requires C++14
 compiler.blacklist-append {clang < 602}