Merge remote-tracking branch 'wiistriker/patch-1'

src/Monolog/Formatter/LineFormatter.php

@@ -94,7 +94,7 @@ class LineFormatter extends NormalizerFormatter
 
         $data = $this->normalize($data);
         if (version_compare(PHP_VERSION, '5.4.0', '>=')) {
-            return $this->toJson($data);
+            return $this->toJson($data, true);
         }
 
         return str_replace('\\/', '/', json_encode($data));