Fix 5.3 support

src/Monolog/Formatter/LineFormatter.php

@@ -168,7 +168,7 @@ class LineFormatter extends NormalizerFormatter
     {
         if ($this->allowInlineLineBreaks) {
             if (0 === strpos($str, '{')) {
-                return str_replace(['\r', '\n'], ["\r", "\n"], $str);
+                return str_replace(array('\r', '\n'), array("\r", "\n"), $str);
             }
 
             return $str;