Force platform version

Author: paul999

composer.json

@@ -10,7 +10,7 @@
     ],
     "minimum-stability": "stable",
     "require": {
-        "php": ">=5.5.0",
+        "php": ">=5.5.9",
         "symfony/yaml": "~2.3|~3.0",
         "symfony/console": "~2.3|~3.0",
         "symfony/finder": "~2.3|~3.0",
@@ -28,7 +28,10 @@
         "src/EPV.php"
     ],
     "config": {
-        "bin-dir": "bin"
+        "bin-dir": "bin",
+        "platform": {
+            "php": "5.5.9"
+        }
     },
     "autoload": {
         "psr-4": {