Update PR Template (#1129)

.github/pull_request_template.md

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+<!-- Prepend '[WIP]' to the title if this PR is still a work-in-progress. Remove it when it is ready for review! -->
+
+## Description
+
+Fixes #000.
+
+<!-- Description of the changes introduced by this PR. -->
+
+## TODOs
+
+Read the [Gruntwork contribution guidelines](https://gruntwork.notion.site/Gruntwork-Coding-Methodology-02fdcd6e4b004e818553684760bf691e).
+
+- [ ] Update the docs.
+- [ ] Run the relevant tests successfully, including pre-commit checks.
+- [ ] Ensure any 3rd party code adheres with our [license policy](https://www.notion.so/gruntwork/Gruntwork-licenses-and-open-source-usage-policy-f7dece1f780341c7b69c1763f22b1378) or delete this line if its not applicable.
+- [ ] Include release notes. If this PR is backward incompatible, include a migration guide.
+
+## Release Notes (draft)
+
+<!-- One-line description of the PR that can be included in the final release notes. -->
+Added / Removed / Updated [X].
+
+### Migration Guide
+
+<!-- Important: If you made any backward incompatible changes, then you must write a migration guide! -->