chore(PR-template)

Author: paulineribeyre

pull_request_template.md

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+Description about what this pull request does.
+
+Please make sure to follow the [DEV guidelines](https://gen3.org/resources/developer/dev-introduction/) before asking for review.
+
+### New Features
+
+- Implemented XXX
+
+### Breaking Changes
+
+
+### Bug Fixes
+
+
+### Improvements
+
+
+### Dependency updates
+
+
+### Deployment changes
+