Update README.md

Author: Andreu Correa Casablanca

README.md

@@ -2,8 +2,7 @@ php-bignumbers [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://git
 ==============
 
 A robust library to handle immutable big numbers inside PHP applications
-The current stable version is 0.7.3. Litipk\BigNumbers supports PHP 5.4.x, 5.5.x, 5.6.x and
-7.0.x but also Facebook's [HHVM](http://www.hhvm.com).
+The current stable version is 0.7.3. Litipk\BigNumbers supports PHP 7.x.
 
 
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