Update pull_request_template.md

.github/pull_request_template.md

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 # Contributing a new country ?
 
-* [ ] Have you checked to ensure there aren't other open [Pull Requests](../../pulls) for the same country?
+* [ ] Have you checked to ensure there aren't other open [Pull Requests](https://github.com/spatie/holidays/pulls) for the same country?
 
 1. Create a new class in the Countries directory. It should extend the Country class.
 2. Add a test for the new country in the tests directory.