Make sure you have checked _all_ steps below. Prune some whitespace
### Jira - [x] My PR addresses the following [Airflow Jira](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references them in the PR title. For example, "\[AIRFLOW-2918\] My Airflow PR" - https://issues.apache.org/jira/browse/AIRFLOW-2918 - In case you are fixing a typo in the documentation you can prepend your commit with \[AIRFLOW-2918\], code changes always need a Jira issue. [ Full content available at: https://github.com/apache/incubator-airflow/pull/3931 ] This message was relayed via gitbox.apache.org for [email protected]
