readme update for v0.4 release

Author: jeevatkm

README.md

@@ -1,16 +1,16 @@
 # config - aah framework
 
 [![Build Status](https://travis-ci.org/go-aah/config.svg?branch=master)](https://travis-ci.org/go-aah/config)  [![codecov](https://codecov.io/gh/go-aah/config/branch/master/graph/badge.svg)](https://codecov.io/gh/go-aah/config/branch/master)  [![Go Report Card](https://goreportcard.com/badge/aahframework.org/config.v0)](https://goreportcard.com/report/aahframework.org/config.v0)
-[![Version](https://img.shields.io/badge/version-0.3-blue.svg)](https://github.com/go-aah/config/releases/latest) [![GoDoc](https://godoc.org/aahframework.org/config.v0?status.svg)](https://godoc.org/aahframework.org/config.v0)  [![License](https://img.shields.io/github/license/go-aah/config.svg)](LICENSE)
+[![Version](https://img.shields.io/badge/version-0.4-blue.svg)](https://github.com/go-aah/config/releases/latest) [![GoDoc](https://godoc.org/aahframework.org/config.v0?status.svg)](https://godoc.org/aahframework.org/config.v0)  [![License](https://img.shields.io/github/license/go-aah/config.svg)](LICENSE)
 
-***v0.3 [released](https://github.com/go-aah/config/releases/latest) and tagged on Mar 12, 2017***
+***v0.4 [released](https://github.com/go-aah/config/releases/latest) and tagged on Apr 10, 2017***
 
 `config` library is powerful and flexible for configuration purpose. It's thin layer around `forge` config syntax which is very similar to Typesafe HOCON syntax :satisfied:. aah framework and it's modules is powered with `aah/config` library.
 
 *`config` developed for aah framework. However it's an independent library, can be used separately with any `Go` language project. Feel free to use it.*
 
 # Installation
-#### Stable - Version
+#### Stable Version - Production Ready
 ```sh
 # install the library
 go get -u aahframework.org/config.v0