Create pull_request_template.md

Author: phip1611

Diff for: .github/PULL_REQUEST_TEMPLATE.md

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+*Descriptive Summary of your Bugfix, Feature, or Refactoring.*
+
+## Checklist
+- [ ] Sensible git history (for example, squash "typo" or "fix" commits). See the
+      [Rewriting History](https://git-scm.com/book/en/v2/Git-Tools-Rewriting-History) guide for
+      details.
+- [ ] updated the changelog (if necessary)