Rev 0.19 adds a missing include to the dist

Author: jmacd

configure.ac

@@ -4,7 +4,7 @@
 # by homebrew, see the commands to set PKG_CONFIG_PATH in build.sh.
 
 AC_PREREQ([2.69])
-AC_INIT([lightstep-tracer-cpp], [0.18],
+AC_INIT([lightstep-tracer-cpp], [0.19],
         [https://github.com/lightstep/lightstep-tracer-cpp/issues])
 LT_INIT([disable-shared])
 AM_INIT_AUTOMAKE([1.14 foreign subdir-objects])

src/c++11/Makefile.am

@@ -21,6 +21,7 @@ nobase_include_HEADERS = \
 	lightstep/collector.grpc.pb.h \
 	lightstep/collector.pb.h \
 	lightstep/envoy_carrier.pb.h \
+	lightstep/envoy.h \
 	lightstep/impl.h \
 	lightstep/options.h \
 	lightstep/propagation.h \