Upgrade to Parsedown-extra

composer.json

@@ -12,7 +12,7 @@
         }
     ],
     "require": {
-        "php": ">=5.2.4",
+        "php": ">=5.3.2",
         "twig/twig": "1.18.*",
         "erusev/parsedown-extra": "dev-master@dev"
     },