Change version to 1.5.2
diff --git a/rpc_util.go b/rpc_util.go
index 0978445..ace206b 100644
--- a/rpc_util.go
+++ b/rpc_util.go
@@ -519,6 +519,6 @@
 const SupportPackageIsVersion4 = true
 
 // Version is the current grpc version.
-const Version = "1.5.2-dev"
+const Version = "1.5.2"
 
 const grpcUA = "grpc-go/" + Version