Added donation link

Author: babenkoivan

README.md

@@ -3,8 +3,12 @@
 [![Packagist](https://img.shields.io/packagist/v/babenkoivan/scout-elasticsearch-driver.svg)](https://packagist.org/packages/babenkoivan/scout-elasticsearch-driver)
 [![Packagist](https://img.shields.io/packagist/dt/babenkoivan/scout-elasticsearch-driver.svg)](https://packagist.org/packages/babenkoivan/scout-elasticsearch-driver)
 [![Gitter](https://img.shields.io/gitter/room/nwjs/nw.js.svg)](https://gitter.im/scout-elasticsearch-driver/Lobby)
+[![Donate](https://img.shields.io/badge/donate-PayPal-blue.svg)](https://www.paypal.me/ivanbabenko)
 
-:exclamation: The project has a [chat room](https://gitter.im/scout-elasticsearch-driver/Lobby) on Gitter!
+:coffee: If you like my package, it'd be nice of you [to buy me a cup of coffee](https://www.paypal.me/ivanbabenko). 
+:octocat: The project has a [chat room on Gitter](https://gitter.im/scout-elasticsearch-driver/Lobby)!
+
+---
 
 This package offers advanced functionality for searching and filtering data in Elasticsearch.
 Check out its [features](#features)!