message: Fix unexpected output.
diff: @@ -57,7 +57,7 @@ if (IS_IN_TRAVIS) {
  define('HTTPBIN_SERVER_HOST', 'httpbin');
  define('HTTPBIN_SERVER_PORT', 80);
  define('HTTPBIN_LOCALLY', true);
  -} elseif (!empty($info = `docker ps | grep httpbin 2>&1`) &&
  +} elseif (!empty($info = `docker ps 2>&1 | grep httpbin 2>&1`) &&
  preg_match('/\s+?[^:]+:(\d+)->\d+\/tcp\s+/', $info, $matches) &&
  is_numeric($matches[1])
  ) {
  