kibana/.github/PULL_REQUEST_TEMPLATE.md

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Thank you for your interest in and contributing to Kibana! There
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- Have you signed the [contributor license agreement](https://www.elastic.co/contributor-agreement)?
- Have you followed the [contributor guidelines](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md)?
- If submitting code, have you included unit tests that cover the changes?
- If submitting code, have you tested and built your code locally prior to submission with `yarn test && yarn build`?
- If submitting code, is your pull request against master? Unless there is a good reason otherwise, we prefer pull requests against master and will backport as needed.
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