Implemented missing wait_for_completion feature from baseTriggerDagRunOperator class
#32
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The Airflow core
TriggerDagRunOperatorclass does have await_for_completionparameter](https://airflow.apache.org/docs/apache-airflow/stable/_api/airflow/operators/trigger_dagrun/index.html#airflow.operators.trigger_dagrun.TriggerDagRunOperator) which was missing in theexecutemethod implementation of theTriggerMultiDagRunOperatorsubclass.Taking the base implementation as an example, I added the feature to this package, which I am using now in personal projects. Works fine so far, now the DAG that triggers other DAG runs just waits until they are completed to mark itself as "succeed".