Merge pull request #2 from veloxy/patch-1

Corrected installation instructions

Author: kouinkouin

README.md

@@ -15,7 +15,7 @@ _bpost API library_ is a PHP library which permit to your PHP application to com
 ## Installation
 
 ```bash
-composer install antidot-be/bpost-api-library
+composer require antidot-be/bpost-api-library
 ```
 
 ## Usages