Pull request template

Author: anakinj

.github/pull_request_template.md

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+
+### Description
+
+This Pull Request changes/fixes this thing
+
+### Checklist
+
+Before the PR can be merged be sure the following are checked:
+* [ ] There are tests for the fix or feature added/changed
+* [ ] A description of the changes and a reference to the PR has been added to CHANGELOG.md. More details in the [CONTRIBUTING.md](https://github.com/jwt/ruby-jwt/blob/main/CONTRIBUTING.md)