Require at least php5.4

Author: redthor

composer.json

@@ -13,7 +13,7 @@
         "antimattr/mongodb-migrations" : "*"
     },
     "require": {
-        "php": ">=5.3.2",
+        "php": ">=5.4.45",
         "doctrine/mongodb": "1.*",
         "symfony/console": "^2.5|^3.0|^4",
         "symfony/yaml": "^2.5|^3.0|^4"