Added a declaration in the README that the package is using Semantic Versioning.

Author: Derek Caswell

README.md

@@ -17,6 +17,7 @@ to your `composer.json` file and update or install directly with composer requir
 ```
 $ php composer.phar require strikewood/omnipay-first-atlantic-commerce:dev-master
 ```
+This package strives to use Semantic Versioning as explained [here](http://semver.org/).
 
 ## Basic Usage