add grpc module
diff --git a/.gitmodules b/.gitmodules
index 79580f4..9fdae17 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,7 @@
 [submodule "third_party/grpc-c"]
 	path = third_party/grpc-c
 	url = https://github.com/shadansari/grpc-c.git
+[submodule "third_party/grpc"]
+	path = third_party/grpc
+	url = https://github.com/grpc/grpc.git
+	branch = tags/v1.1.4