Added missing require block

Graham Campbell · Graham Campbell · commit a919f0fb3446 · 2015-06-12T23:18:03.000+01:00
diff --git a/composer.json b/composer.json
@@ -10,6 +10,9 @@
             "email": "opensource@ijaap.nl"
         }
     ],
+    "require": {
+        "php": ">=5.5"
+    },
     "autoload" : {
       "psr-4" : {
         "phpDocumentor\\Reflection\\": ["src"]
