Added: buy me a coffee to README.md

README.md

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 [![PyPI pyversions](https://img.shields.io/pypi/pyversions/mloptimizer.svg)](https://pypi.python.org/pypi/mloptimizer/)
 [![Tests](https://github.com/Caparrini/mloptimizer/actions/workflows/CI.yml/badge.svg)](https://github.com/Caparrini/mloptimizer/actions/workflows/CI.yml)
 [![Coverage Status](http://codecov.io/github/Caparrini/mloptimizer/coverage.svg?branch=master)](https://app.codecov.io/gh/Caparrini/mloptimizer)
+[![Shield: Buy me a coffee](https://img.shields.io/badge/Buy%20me%20a%20coffee-Support-yellow?logo=buymeacoffee)](https://www.buymeacoffee.com/caparrini)
+
 
 
 **mloptimizer** is a Python library for optimizing hyperparameters of machine learning algorithms using genetic algorithms.