Update README.md

Author: stevencedro

README.md

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 # webcrypto-go [![test](https://github.com/armortal/webcrypto-go/actions/workflows/test.yaml/badge.svg)](https://github.com/armortal/webcrypto-go/actions/workflows/test.yaml)
 
-An implementation of the W3C Web Cryptography API specification (https://www.w3.org/TR/WebCryptoAPI/) for Go.
+An implementation of the W3C Web Cryptography API specification (https://www.w3.org/TR/WebCryptoAPI/) for Go using Go's standard `crypto` library.
 
 ## Contents