Change version to 1.7.4
diff --git a/rpc_util.go b/rpc_util.go
index 22da6bb..54fc3ec 100644
--- a/rpc_util.go
+++ b/rpc_util.go
@@ -567,6 +567,6 @@
 const SupportPackageIsVersion4 = true
 
 // Version is the current grpc version.
-const Version = "1.7.4-dev"
+const Version = "1.7.4"
 
 const grpcUA = "grpc-go/" + Version