Update README.md

Macsch15 · Jul 7, 2015 · 817613d · 817613d
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 ###Crawler Detector
-Fat-free and fast web crawler (bot) detector
+Fat-free, standalone and fast web crawler (bot) detector
 
 Special thanks for [Piwik team](http://piwik.org/team/) for the [crawlers regexes](https://github.com/piwik/device-detector/blob/master/regexes/bots.yml) :heart:
 
+###Requirements
+- PHP 5.4 (or above)
+
 ###Usage
 ```
 $ composer require macsch15/crawler-detector dev-master