refactor: replace newlines with html line breaks in init error stack …

…trace

myparcelnl.php

@@ -209,7 +209,7 @@ private function withErrorHandling(
                 '<hr>%s: %s<br><br><b>Stack trace:</b><br><code>%s</code>',
                 $message ?? 'Error',
                 $e->getMessage(),
-                $e->getTraceAsString()
+                str_replace("\n", '<br>', $e->getTraceAsString())
             );
 
             if ($failureCallback) {