Update some code, add security txt file.

app/Helpers/Report/PopupReport.php

@@ -57,11 +57,8 @@ class PopupReport implements PopupReportInterface
         return $journals->filter(
             function (Transaction $transaction) {
                 $tags = $transaction->transactionJournal->tags()->where('tagMode', 'balancingAct')->count();
-                if (0 === $tags) {
-                    return true;
-                }
 
-                return false;
+                return 0 === $tags;
             }
         );
     }

app/Helpers/Report/ReportHelper.php

@@ -119,6 +119,7 @@ class ReportHelper implements ReportHelperInterface
      * @param Carbon $date
      *
      * @return array
+     * @throws \InvalidArgumentException
      */
     public function listOfMonths(Carbon $date): array
     {