Update index.php

Author: shi-yang

install/index.php

@@ -18,7 +18,7 @@
 use yii\base\Security;
 
 $sqlFile = 'data.sql';
-$iisnsVersion = '2.1.3';
+$iisnsVersion = '0.5.0-alpha';
 
 header('Content-Type: text/html; charset=utf-8');
 $PHP_SELF = addslashes(htmlspecialchars($_SERVER['PHP_SELF'] ? $_SERVER['PHP_SELF'] : $_SERVER['SCRIPT_NAME']));