update readme

Author: JBlond

README.md

@@ -1,12 +1,11 @@
-PHP Diff Class
---------------
+# PHP Diff Class
 
 [![SensioLabsInsight](https://insight.sensiolabs.com/projects/aa609edb-cdb1-45cf-ad51-afbdab48f6a1/mini.png)](https://insight.sensiolabs.com/projects/aa609edb-cdb1-45cf-ad51-afbdab48f6a1) [![Codacy Badge](https://api.codacy.com/project/badge/Grade/db5f8d57b1234502aeb852afc87e0dfe)](https://www.codacy.com/app/leet31337/php-diff)
 
 [![Latest Version](https://img.shields.io/github/release/JBlond/php-diff.svg?style=flat-square&label=Release)](https://github.com/JBlond/php-diff/releases)
 
-Introduction
-------------
+## Introduction
+
 A comprehensive library for generating differences between
 two hashable objects (strings or arrays). Generated differences can be
 rendered in all of the standard formats including:
@@ -19,40 +18,46 @@ The logic behind the core of the diff engine (ie, the sequence matcher)
 is primarily based on the Python difflib package. The reason for doing
 so is primarily because of its high degree of accuracy.
 
-Example Use
------------
+
+## Install
+
+```
+composer require jblond/php-diff
+```
+
+## Example Use
+
 A quick usage example can be found in the example/ directory and under
 example.php.
 
 ![Example Image](readme.png "Example")
 
 ![Example 2 Image](readme2.png "Example2")
 
-Requirements
------------
+## Requirements
+
 - PHP 7.1 or greater
 - PHP Multibyte String 
 
-Merge files using jQuery
-------------------------
+## Merge files using jQuery
+
 Xiphe has build a jQuery plugin with that you can merge the compared
 files. Have a look at [jQuery-Merge-for-php-diff](https://github.com/Xiphe/jQuery-Merge-for-php-diff).
 
-Todo
-----
+## Todo
+
  * Ability to ignore blank line changes
  * 3 way diff support
  * Performance optimizations
 
- Contributors
----------------------
+##  Contributors
+
 Contributors since I forked the repo.
 
 - maxxer
 - Creris
 - jfcherng
 
-License (BSD License)
----------------------
+### License (BSD License)
 
 see [License](LICENSE)