changed usage of task-builder (#21)

Author: wachterjohannes

src/Command/ScheduleTaskCommand.php

@@ -83,6 +83,6 @@ protected function execute(InputInterface $input, OutputInterface $output)
             $taskBuilder->executeAt(new \DateTime($executionDateString));
         }
 
-        $this->scheduler->addTask($taskBuilder->getTask());
+        $taskBuilder->schedule();
     }
 }