Update README.md

vinayproses · web-flow · commit 332c899d1a6f · 2017-11-28T16:16:52.000+05:30
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 *A mostly reasonable approach to JavaScript*
 
+> **Note**: this guide for ES6 and assumes you are using [Babel](https://babeljs.io).
+
+- [For ES5 (What we mostly using)](https://github.com/vinayproses/JavaScriptStyleGuide/JSes5StyleGuide.md)
+
 ## Table of Contents
 
   1. [Types](#types)
