Update PR template

Co-authored-by: Maria Shaldibina <[email protected]>

Author: mariash

.github/PULL_REQUEST_TEMPLATE.md

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+Thank you for submitting a pull request to the operationhq repository. We appreciate the contribution. To help us with getting better context for the pull request please follow these guidelines:
+
+## Please make sure to complete the following steps
+
+* [ ] Check the [Contributing document](https://github.com/cloudfoundry/diego-release/blob/develop/CONTRIBUTING.md) on how to sign the CLA and run tests.
+* [ ] Please [open an issue](https://github.com/cloudfoundry/diego-release/issues/new) to request review and response to your pull request.
+
+## Please provide the following information when submitting pull request:
+
+### What is this change about?
+
+> _Please describe._
+
+### What problem it is trying to solve?
+
+> _Please describe._
+
+### What is the impact if the change is not made?
+
+> _Please describe._
+
+### How should this change be described in diego-release release notes?
+
+> _Something brief that conveys the change. See [previous release notes](https://github.com/cloudfoundry/diego-release/releases) for examples._
+
+### Please provide any contextual information.
+
+> _Include any links to other PRs, stories, slack discussions, etc._
+
+### Tag your pair, your PM, and/or team!
+
+> _It's helpful to tag someone on your team or your team alias in case we need to follow up later._
+
+Thank you!