Fix remove square bracket array declaration for PHP 5.3 compatibility (#360)

* Fix remove square bracket array declaration for PHP 5.3 compatibility

* Use dist: precise on Travis to ensure PHP 5.3 compatibility

.travis.yml

@@ -1,5 +1,7 @@
 language: php
 
+dist: precise
+
 php:
   - 5.3
   - 5.4

src/DebugBar/DataCollector/PhpInfoCollector.php

@@ -39,14 +39,13 @@ class PhpInfoCollector extends DataCollector implements Renderable
      */
     public function getWidgets()
     {
-        return [
-            "php_version" => [
+        return array(
+            "php_version" => array(
                 "icon" => "code",
                 "tooltip" => "Version",
                 "map" => "php.version",
                 "default" => ""
-            ],
-        ];
+            ),
+        );
     }
-
 }