Move installation above usage.

Author: Willem Stuursma-Ruwen

README.md

@@ -1,6 +1,11 @@
 # Mollie PHP Coding Standards
 Contains PHP coding standards like rules for PHP-CS-Fixer that serves for purpose of standardization.
 
+## Installation
+```bash
+composer require --dev  mollie/php-coding-standards
+```
+
 ## Usage
 This package makes use of PHP-CS-Fixer.
 
@@ -79,11 +84,6 @@ git diff --diff-filter=ACMRTUXB --name-only --staged | grep -E '\.php(_cs\.dist)
 done
 ```
 
-## Installation
-```bash
-composer require --dev  mollie/php-coding-standards
-```
-
 ## Working at Mollie
 Mollie is always looking for new talent to join our teams. We’re looking for inquisitive minds with good ideas and
 strong opinions, and, most importantly, who know how to ship great products. Want to join the future of payments?