add packagist downloads stats

README.md

@@ -1,5 +1,6 @@
 IP2Location (PHP Module)
 ========================
+[![Total Downloads](https://img.shields.io/packagist/dt/ip2location/ip2location-php.svg?style=flat-square)](https://packagist.org/packages/ip2location/ip2location-php)  
 
 This PHP module provides fast lookup of country, region, city, latitude, longitude, ZIP code, time zone, ISP, domain name, connection speed, IDD code, area code, weather station code, weather station name, MNC, MCC, mobile brand, elevation, and usage type from IP address by using IP2Location database. This module uses a file based database available at IP2Location.com.