Add php_zip requirement

ivanlanin · ivanlanin · commit 07b84302c136 · 2014-03-12T00:46:03.000+07:00
diff --git a/README.md b/README.md
@@ -15,6 +15,7 @@ __Want to contribute?__ Fork us!
 ## Requirements
 
 * PHP version 5.3.0 or higher
+* PHP extension [php_zip](http://php.net/manual/en/book.zip.php) enabled
 
 ## Installation
 
