Update twig deprecated call

Author: sescandell

composer.json

@@ -19,7 +19,7 @@
     ],
     "require": {
         "php": ">=5.3.0",
-        "twig/twig": ">=1.1, <2.0-dev"
+        "twig/twig": "~1.12"
     },
     "require-dev": {
         "phpunit/phpunit": "~4.3"

src/TwigGenerator/Builder/BaseBuilder.php

@@ -331,7 +331,7 @@ protected function loadTwigFilters(\Twig_Environment $twig)
             } else {
                 $twigFilterName = $twigFilter;
             }
-            $twig->addFilter($twigFilterName, new \Twig_Filter_Function($twigFilter));
+            $twig->addFilter($twigFilterName, new \Twig_SimpleFilter($twigFilterName, $twigFilter));
         }
     }