fixed Twig version

Author: fabpot

composer.json

@@ -52,7 +52,7 @@
         "symfony/property-info": "~2.8|~3.0",
         "doctrine/annotations": "~1.0",
         "phpdocumentor/reflection-docblock": "^3.0",
-        "twig/twig": "~1.23|~2.0"
+        "twig/twig": "~1.26|~2.0"
     },
     "conflict": {
         "phpdocumentor/reflection-docblock": "<3.0",