fix reference to protobuf

infra/conf/command/command.go

@@ -5,7 +5,7 @@ package command
 import (
 	"os"
 
-	"github.com/gogo/protobuf/proto"
+	"github.com/golang/protobuf/proto"
 	"v2ray.com/core/common"
 	"v2ray.com/core/infra/conf/serial"
 	"v2ray.com/core/infra/control"