define minimum php version to 5.3

Frederic Dewinne · Frederic Dewinne · commit 1562cd0d81fb · 2015-05-09T11:57:55.000+02:00
diff --git a/composer.json b/composer.json
@@ -17,6 +17,7 @@
     "behat/behat": "^3.0"
   },
   "require": {
+    "php": ">=5.4.0",
     "phing/phing": "~2.9",
     "guzzlehttp/guzzle": "~5.0"
   },
