Change version to 1.6.0
diff --git a/rpc_util.go b/rpc_util.go
index 9f0fb38..9ba1ce0 100644
--- a/rpc_util.go
+++ b/rpc_util.go
@@ -510,6 +510,6 @@
 const SupportPackageIsVersion4 = true
 
 // Version is the current grpc version.
-const Version = "1.6.0-dev"
+const Version = "1.6.0"
 
 const grpcUA = "grpc-go/" + Version