deploy.php from github

gistfile1.php

$githubIPs = array("207.97.227.253", "50.57.128.197", "108.171.174.178", "50.57.231.61");
$errorStatus = "HTTP/1.1 500 Internal Server Error";

if(!in_array($_SERVER["REMOTE_ADDR"],$githubIPs)){
  header($errorStarus);
  die;
}else{
  shell_exec('git pull');                                                                
}