PR checklist

Author: Stephan Dilly

.github/PULL_REQUEST_TEMPLATE.md

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+<!---
+Thank you for contributing to GitUI! Please fill out the template below, and remove or add any
+information as you feel neccesary.
+--->
+
+This Pull Request fixes/closes #{issue_num}.
+
+It changes the following:
+-
+-
+
+I followed the checklist:
+- [ ] I added unittests
+- [ ] I ran `make check` without errors
+- [ ] I tested the overall application