Fix composer.json dependencies

Author: nicolas-grekas

composer.json

@@ -25,7 +25,7 @@
         "symfony/browser-kit": "~2.4|~3.0.0",
         "symfony/console": "~2.5|~3.0.0",
         "symfony/css-selector": "~2.0,>=2.0.5|~3.0.0",
-        "symfony/dependency-injection": "~2.3|~3.0.0",
+        "symfony/dependency-injection": "~2.6,>=2.6.6|~3.0.0",
         "symfony/dom-crawler": "~2.0,>=2.0.5|~3.0.0",
         "symfony/form": "~2.7|~3.0.0",
         "symfony/framework-bundle": "~2.7|~3.0.0",