Change README License link to absolute

This is necessary because otherwise it will not work on pdoc.

README.md

@@ -19,7 +19,7 @@ This is a template repository. Below is a checklist of things you should do to u
 [![Build](https://github.com/cmi-dair/template-python-repository/actions/workflows/test.yaml/badge.svg?branch=main)](https://github.com/cmi-dair/template_python_repository/actions/workflows/test.yaml?query=branch%3Amain)
 [![codecov](https://codecov.io/gh/cmi-dair/template-python-repository/branch/main/graph/badge.svg?token=22HWWFWPW5)](https://codecov.io/gh/cmi-dair/template-python-repository)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
-[![L-GPL License](https://img.shields.io/badge/license-L--GPL-blue.svg)](LICENSE)
+[![L-GPL License](https://img.shields.io/badge/license-L--GPL-blue.svg)]([LICENSE](https://github.com/cmi-dair/template-python-repository/blob/main/LICENSE))
 [![pages](https://img.shields.io/badge/api-docs-blue)](https://cmi-dair.github.io/template-python-repository)