Merge pull request #379 from cert-manager/ARichman555-patch-3

Create PULL_REQUEST_TEMPLATE.md

Author: cert-manager-prow[bot]

.github/PULL_REQUEST_TEMPLATE.md

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+### Issue # (if applicable)
+
+Closes #<issue number here>.
+
+### Reason for this change
+
+<!--What is the bug or use case behind this change?-->
+
+### Description of changes
+
+<!--
+What code changes did you make?
+Have you made any important design decisions?
+What use cases does this change enable?
+-->
+
+### Describe any new or updated permissions being added
+
+<!-- What new or updated IAM permissions are needed to support the changes being introduced ? -->
+
+### Description of how you validated changes
+
+<!--Have you added any unit tests and/or integration tests?-->
+