Upgrade grpc-gateway v2.1 -> v2.3 (#109)

Author: huan

openapi/go.mod

@@ -6,9 +6,9 @@ require (
 	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
 	github.com/golang/protobuf v1.4.3 // indirect
 	github.com/google/protobuf v3.15.0+incompatible // indirect
-	github.com/grpc-ecosystem/grpc-gateway/v2 v2.1.0
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.3.0
 	github.com/wechaty/go-grpc v0.18.12 // indirect
-	google.golang.org/grpc v1.34.0
+	google.golang.org/grpc v1.36.0
 	google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0
-	google.golang.org/protobuf v1.25.0
+	google.golang.org/protobuf v1.25.1-0.20201208041424-160c7477e0e8
 )