Déplacement des dépendances de require-dev vers require.

composer.json

@@ -8,8 +8,6 @@
         }
     ],
     "require": {
-    },
-    "require-dev": {
         "squizlabs/php_codesniffer":                        "3.*",
         "dealerdirect/phpcodesniffer-composer-installer":   "^0.4",
         "slevomat/coding-standard":                         "^4.0",