Fix required Python version badge

Need to use the PEP621 TOML badge

Author: dannyadair

README.md

@@ -3,7 +3,7 @@
 [![PyPI version](https://img.shields.io/pypi/v/pdfbaker)](https://pypi.org/project/pdfbaker/)
 [![tests](https://github.com/pythonnz/pdfbaker/actions/workflows/tests.yaml/badge.svg)](https://github.com/pythonnz/pdfbaker/actions/workflows/tests.yaml)
 [![Last commit](https://img.shields.io/github/last-commit/pythonnz/pdfbaker)](https://github.com/pythonnz/pdfbaker/commits/main)
-[![Python](https://img.shields.io/pypi/pyversions/pdfbaker)](https://github.com/pythonnz/pdfbaker/blob/main/pyproject.toml)
+[![Python](https://img.shields.io/python/required-version-toml?tomlFilePath=https%3A%2F%2Fraw.githubusercontent.com%2Fpythonnz%2Fpdfbaker%2Frefs%2Fheads%2Fmain%2Fpyproject.toml)](https://github.com/pythonnz/pdfbaker/blob/main/pyproject.toml)
 [![codecov](https://codecov.io/gh/pythonnz/pdfbaker/branch/main/graph/badge.svg)](https://codecov.io/gh/pythonnz/pdfbaker)
 [![Downloads](https://img.shields.io/pypi/dw/pdfbaker)](https://pypistats.org/packages/pdfbaker)
 [![License](https://img.shields.io/github/license/pythonnz/pdfbaker)](https://github.com/pythonnz/pdfbaker/blob/main/LICENSE)