Update readme

Author: Peter Matseykanets

README.md

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 [![Total Downloads](https://img.shields.io/packagist/dt/pmatseykanets/laravel-scout-postgres.svg?style=flat-square)](https://packagist.org/packages/pmatseykanets/laravel-scout-postgres)
 [![License](https://poser.pugx.org/pmatseykanets/laravel-scout-postgres/license)](https://github.com/pmatseykanets/laravel-scout-postgres/blob/master/LICENSE.md)
 
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 This package makes it easy to use native PostgreSQL Full Text Search capabilities with [Laravel Scout](http://laravel.com/docs/master/scout).
 
 ## Contents