Merge pull request #19 from holloway87/master

enable self-update command only with php 5.6 or higher

Author: webmozart

src/PuliApplicationConfig.php

@@ -489,7 +489,7 @@ function (PreHandleEvent $event) use ($context) {
                 ->setHandler(function () {
                     return new SelfUpdateCommandHandler();
                 })
-                ->enableIf('phar://' === substr(__DIR__, 0, 7))
+                ->enableIf('phar://' === substr(__DIR__, 0, 7) && version_compare(PHP_VERSION, '5.6', '>='))
             ->end()
         ;