remove incompatible Twig version

Currently, the SecurityBundle is not compatible with Twig 2.0 as it is missing the implementation of the `Twig_Extension_InitRuntimeInterface`. Thus, `initRuntime()` would not be called with Twig 2.0 anymore.
symfony · xabbuh · Oct 30, 2015 · Oct 30, 2015 · 8c702af58dde3f011d016e3e1aa62d9de64ddfc0
commit 8c702af58dde3f011d016e3e1aa62d9de64ddfc0
diff --git a/src/Symfony/Bundle/SecurityBundle/composer.json b/src/Symfony/Bundle/SecurityBundle/composer.json
@@ -34,7 +34,7 @@
        "symfony/process": "~2.0,>=2.0.5",
        "symfony/validator": "~2.2",
        "symfony/yaml": "~2.0,>=2.0.5",
-        "twig/twig": "~1.20|~2.0"
+        "twig/twig": "~1.20"
    },
    "autoload": {
        "psr-0": { "Symfony\\Bundle\\SecurityBundle\\": "" }