Add public dir to slim 3.12

Author: joanhey

slim-3.12/_benchmark/hello_world.sh

@@ -1,2 +1,2 @@
 #!/bin/sh
-url="$base/$fw/index.php/hello/index"
+url="$base/$fw/public/index.php/hello/index"

slim-3.12/index.php renamed to slim-3.12/public/index.php

@@ -1,5 +1,5 @@
 <?php
-require __DIR__ . '/vendor/autoload.php';
+require __DIR__ . '/../vendor/autoload.php';
 
 
 $app = new \Slim\App();