Update README.md

Author: TiSiE

README.md

@@ -3,24 +3,22 @@ CROSS PHPUnit Utils
 
 This package contains various utilities to aid in writing unit tests with the PHPUnit Framework.
 
-
 Installation
 ------------
 
 Require a dependency via composer.
 
 ```bash
-composer require cross-solution/phpunit-utils
+composer require --dev cross-solution/phpunit-utils
 ```
 
-
 Usage
 -----
 
-@todo
+At the moment, the documentation is solely in the PHPDocs comments of the source files.
 
 
-Licence
+License
 -------
 
 MIT