update readme

Author: phattarachai

README.md

@@ -1,7 +1,7 @@
 Agent
 =====
 
-[![Latest Stable Version](http://img.shields.io/packagist/v/phattarachai/laravel-mobile-detect.svg)](https://packagist.org/packages/phattarachai/laravel-mobile-detect)
+[![Latest Stable Version](https://img.shields.io/packagist/v/phattarachai/laravel-mobile-detect.svg)](https://packagist.org/packages/phattarachai/laravel-mobile-detect)
 [![Total Downloads](https://img.shields.io/packagist/dt/phattarachai/laravel-mobile-detect.svg)](https://packagist.org/packages/phattarachai/laravel-mobile-detect)
 
 Thanks  [jenssegers/agent](https://github.com/jenssegers/agent) for the original version.