vendorify compiletime deps
diff --git a/go/Gopkg.toml b/go/Gopkg.toml
index 150d321..7f8e8c3 100644
--- a/go/Gopkg.toml
+++ b/go/Gopkg.toml
@@ -24,6 +24,7 @@
 #   go-tests = true
 #   unused-packages = true
 
+required = ["github.com/golang/protobuf/protoc-gen-go", "github.com/gobuffalo/packr/packr"]
 
 [[constraint]]
   name = "github.com/cenkalti/backoff"