bump python to 3.10+ in readme, thanks @QuantumChemist

README.md

@@ -12,7 +12,7 @@ height="70">
 [![codecov](https://codecov.io/gh/materialsproject/pymatgen/branch/master/graph/badge.svg?token=XC47Un1LV2)](https://codecov.io/gh/materialsproject/pymatgen)
 [![PyPI Downloads](https://img.shields.io/pypi/dm/pymatgen?logo=pypi&logoColor=white&color=blue&label=PyPI)](https://pypi.org/project/pymatgen)
 [![Conda Downloads](https://img.shields.io/conda/dn/conda-forge/pymatgen?logo=condaforge&color=blue&label=Conda)](https://anaconda.org/conda-forge/pymatgen)
-[![Requires Python 3.9+](https://img.shields.io/badge/Python-3.9+-blue.svg?logo=python&logoColor=white)](https://python.org/downloads)
+[![Requires Python 3.10+](https://img.shields.io/badge/Python-3.10+-blue.svg?logo=python&logoColor=white)](https://python.org/downloads)
 [![Paper](https://img.shields.io/badge/J.ComMatSci-2012.10.028-blue?logo=elsevier&logoColor=white)](https://doi.org/10.1016/j.commatsci.2012.10.028)
 
 </h4>
@@ -63,7 +63,7 @@ If you'd like to use the latest unreleased changes on the main branch, you can i
 pip install -U git+https://github.com/materialsproject/pymatgen
 ```
 
-The minimum Python version is 3.9. Some extra functionality (e.g., generation of POTCARs) does require additional setup (see the [`pymatgen` docs]).
+The minimum Python version is 3.10. Some extra functionality (e.g., generation of POTCARs) does require additional setup (see the [`pymatgen` docs]).
 
 ## Change Log