Adjust DOI to version-independent one
@@ -34,7 +34,7 @@ of the [University of Passau](https://www.uni-passau.de).
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[![Supported Python Versions](https://img.shields.io/pypi/pyversions/pynguin.svg)](https://gitlab.com/pynguin/pynguin)
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-[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.3989841.svg)](https://doi.org/10.5281/zenodo.3989841)
+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.3989840.svg)](https://doi.org/10.5281/zenodo.3989840)
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