Update the README to reflect changed requirements etc.

README.md

@@ -14,9 +14,9 @@
 
 ## Requirements
 
-- PHP 5.6 or newer
+- PHP 7.1 or newer
 - [Composer](http://getcomposer.org)
-- [Lumen](https://lumen.laravel.com/) 5.3 or newer
+- [Lumen](https://lumen.laravel.com/) 5.4 or newer
 
 ## Setup
 
@@ -30,8 +30,8 @@ composer require nordsoftware/lumen-fractal
 
 ### Configuration
 
-Copy the configuration template in `config/fractal.php` to your application's `config` directory and modify according to your needs.
-For more information see the [Configuration Files](http://lumen.laravel.com/docs/configuration#configuration-files) section in the Lumen documentation.
+Copy the configuration template in `config/fractal.php` to your application's `config` directory and modify according 
+to your needs.
 
 Available configuration options:
 
@@ -91,7 +91,7 @@ composer install
 Run the following command to run the test suite:
 
 ```sh
-vendor/bin/codecept run unit
+vendor/bin/codecept run
 ```
 
 ## License