use the parseFile() method of the YAML parser

Author: xabbuh

Loader/YamlFileLoader.php

@@ -39,7 +39,7 @@ protected function loadResource($resource)
         }
 
         try {
-            $messages = $this->yamlParser->parse(file_get_contents($resource));
+            $messages = $this->yamlParser->parseFile($resource);
         } catch (ParseException $e) {
             throw new InvalidResourceException(sprintf('Error parsing YAML, invalid file "%s"', $resource), 0, $e);
         }

composer.json

@@ -23,14 +23,14 @@
         "symfony/config": "~2.8|~3.0|~4.0",
         "symfony/dependency-injection": "~3.4|~4.0",
         "symfony/intl": "^2.8.18|^3.2.5|~4.0",
-        "symfony/yaml": "~3.3|~4.0",
+        "symfony/yaml": "~3.4|~4.0",
         "symfony/finder": "~2.8|~3.0|~4.0",
         "psr/log": "~1.0"
     },
     "conflict": {
         "symfony/config": "<2.8",
         "symfony/dependency-injection": "<3.4",
-        "symfony/yaml": "<3.3"
+        "symfony/yaml": "<3.4"
     },
     "suggest": {
         "symfony/config": "",