Update README.md

Author: pipozzz

README.md

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 # cryptopay
-Python API wrapper for [Crypto.com Pay](https://pay-docs.crypto.com)
+Python API wrapper for [Crypto.com Pay Checkout](https://pay-docs.crypto.com)
 
 ![Travis (.com)](https://img.shields.io/travis/com/pipoline/cryptopay) ![Codecov](https://img.shields.io/codecov/c/github/pipoline/cryptopay) ![PyPI - Downloads](https://img.shields.io/pypi/dm/cryptopay) ![PyPI](https://img.shields.io/pypi/v/cryptopay)
 ### Installation