remove json pretty print option

Author: lesstif

src/Issue/IssueService.php

@@ -955,7 +955,7 @@ public function updateLabels($issueIdOrKey, $addLablesParam, $removeLabelsParam,
             'update' => [
                 'labels' => $labels,
             ],
-        ], JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT);
+        ], JSON_UNESCAPED_UNICODE);
 
         $this->log->addInfo("Update labels=\n".$postData);