Updated readme for version 4.

Author: evert

README.md

@@ -6,33 +6,40 @@ and [vCard](https://tools.ietf.org/html/rfc6350) objects using PHP.
 
 The goal of the VObject library is to create a very complete library, with an easy to use API.
 
-Build status
-------------
-
-| branch | status |
-| ------ | ------ |
-| master | [![Build Status](https://travis-ci.org/fruux/sabre-vobject.svg?branch=master)](https://travis-ci.org/fruux/sabre-vobject) |
-| 3.4    | [![Build Status](https://travis-ci.org/fruux/sabre-vobject.svg?branch=3.4)](https://travis-ci.org/fruux/sabre-vobject) |
-| 3.1    | [![Build Status](https://travis-ci.org/fruux/sabre-vobject.svg?branch=3.1)](https://travis-ci.org/fruux/sabre-vobject) |
-| 2.1    | [![Build Status](https://travis-ci.org/fruux/sabre-vobject.svg?branch=2.1)](https://travis-ci.org/fruux/sabre-vobject) |
-| 2.0    | [![Build Status](https://travis-ci.org/fruux/sabre-vobject.svg?branch=2.0)](https://travis-ci.org/fruux/sabre-vobject) |
-
 
 Installation
 ------------
 
 Make sure you have [Composer][1] installed, and then run:
 
+    composer require sabre/vobject "^4.0"
+
+This package requires PHP 5.5. If you need the PHP 5.3/5.4 version of this package instead, use:
+
+
     composer require sabre/vobject "^3.4"
 
-This package requires PHP 5.3.
 
 Usage
 -----
 
-* [3.x documentation](http://sabre.io/vobject/usage/)
-* [2.x documentation](http://sabre.io/vobject/usage_2/)
-* [Migrating from 2.x to 3.x](http://sabre.io/vobject/upgrade/)
+* [Working with vCards](http://sabre.io/vobject/vcard/)
+* [Working with iCalendar](http://sabre.io/vobject/icalendar/)
+
+
+
+Build status
+------------
+
+| branch | status |
+| ------ | ------ |
+| master | [![Build Status](https://travis-ci.org/fruux/sabre-vobject.svg?branch=master)](https://travis-ci.org/fruux/sabre-vobject) |
+| 3.4    | [![Build Status](https://travis-ci.org/fruux/sabre-vobject.svg?branch=3.4)](https://travis-ci.org/fruux/sabre-vobject) |
+| 3.1    | [![Build Status](https://travis-ci.org/fruux/sabre-vobject.svg?branch=3.1)](https://travis-ci.org/fruux/sabre-vobject) |
+| 2.1    | [![Build Status](https://travis-ci.org/fruux/sabre-vobject.svg?branch=2.1)](https://travis-ci.org/fruux/sabre-vobject) |
+| 2.0    | [![Build Status](https://travis-ci.org/fruux/sabre-vobject.svg?branch=2.0)](https://travis-ci.org/fruux/sabre-vobject) |
+
+
 
 Support
 -------