diff --git a/demo_test/vendor/google.golang.org/protobuf/CONTRIBUTORS b/demo_test/vendor/google.golang.org/protobuf/CONTRIBUTORS
new file mode 100644
index 0000000..1fbd3e9
--- /dev/null
+++ b/demo_test/vendor/google.golang.org/protobuf/CONTRIBUTORS
@@ -0,0 +1,3 @@
+# This source code was written by the Go contributors.
+# The master list of contributors is in the main Go distribution,
+# visible at https://tip.golang.org/CONTRIBUTORS.