Changed the error message about the PHP requirement to go to STDERR

php-cs-fixer

@@ -15,7 +15,7 @@
  */
 
 if (version_compare(phpversion(), '5.3.6', '<')) {
-    echo "PHP needs to be a minimum version of PHP 5.3.6\n";
+    fwrite(STDERR, "PHP needs to be a minimum version of PHP 5.3.6\n");
     exit(1);
 }