### 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, "\[AIRFLOW-XXX\] My Airflow PR" - https://issues.apache.org/jira/browse/AIRFLOW-2947
### Description - [X] Here are some details about my PR, including screenshots of any UI changes: Added Helm chart for Airflow. ### Tests - [ ] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason: This probably should run helm lint, happy to add it if someone can show me how to integrate it into Travis CI. ### Commits - [X] My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)": [ Full content available at: https://github.com/apache/incubator-airflow/pull/3792 ] This message was relayed via gitbox.apache.org for [email protected]
