Require symfony/dotenv in prod too

Author: javiereguiluz

composer.json

@@ -15,6 +15,7 @@
         "sensiolabs/security-checker": "^5.0",
         "symfony/asset": "*",
         "symfony/console": "*",
+        "symfony/dotenv": "*",
         "symfony/expression-language": "*",
         "symfony/flex": "^1.1",
         "symfony/form": "*",
@@ -40,7 +41,6 @@
         "symfony/browser-kit": "*",
         "symfony/css-selector": "*",
         "symfony/debug-bundle": "*",
-        "symfony/dotenv": "*",
         "symfony/maker-bundle": "^1.11",
         "symfony/phpunit-bridge": "*",
         "symfony/stopwatch": "*",