added XSS filtering method

Author: yajra

readme.md

@@ -28,6 +28,7 @@ This package is created to handle [server-side](https://www.datatables.net/manua
 - Decorate your data output using [`league\fractal`](https://github.com/thephpleague/fractal) Transformer.
 - Works with Laravel Dependency Injection and IoC Container.
 - Provides a [DataTable Html Builder](http://datatables.yajrabox.com/html) to help you use the package with less code.
+- Provides XSS filtering function to optionally escape all or specified column values using `escapeColumns('*'\['column'])` method.
 
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