update readme

Author: Neargye

README.md

@@ -12,7 +12,7 @@
 [![Build Status](https://travis-ci.org/Neargye/nameof.svg?branch=master)](https://travis-ci.org/Neargye/nameof)
 [![Build status](https://ci.appveyor.com/api/projects/status/yq5fk0d9mwljbubt/branch/master?svg=true)](https://ci.appveyor.com/project/Neargye/nameof/branch/master)
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/1d06f3f07afe4f34acd29c0c8efa830b)](https://www.codacy.com/app/Neargye/nameof?utm_source=github.com&utm_medium=referral&utm_content=Neargye/nameof&utm_campaign=Badge_Grade)
-[![Try online](https://img.shields.io/badge/try-online-blue.svg)](https://wandbox.org/permlink/1biubvidzJXEKr69)
+[![Try online](https://img.shields.io/badge/try-online-blue.svg)](https://wandbox.org/permlink/XjaqDqqHOGJT56HE)
 
 # Nameof C++
 
@@ -59,6 +59,11 @@ Header-only C++17 library provides nameof macros and functions to obtain simple
   // Name of enum variable.
   NAMEOF_ENUM(color) -> "RED"
   nameof::nameof_enum(color) -> "RED"
+
+  // Static storage enum variable to string.
+  // This version is much lighter on the compile times and is not restricted to the enum_range limitation.
+  NAMEOF_CONST_ENUM(Color::GREEN) -> "GREEN"
+  nameof::nameof_enum<Color::GREEN>() -> "GREEN"
   ```
 
 * Nameof type