Update dependencies as require. (#15)

Author: jmolivas

composer.json

@@ -9,15 +9,15 @@
         }
     ],
     "require": {
+        "symfony/yaml": ">=2.7 <3.0",
+        "symfony/finder": ">=2.7 <3.0"
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
     "autoload": {
         "psr-4": {"Drupal\\Console\\Extend\\": "src"}
     },
     "require-dev": {
-        "symfony/yaml": ">=2.7 <3.0",
-        "symfony/finder": ">=2.7 <3.0",
         "composer/installers": "^1.2"
     },
     "scripts": {