README: Adjust licensing badges

Signed-off-by: Hanno Becker <[email protected]>

Author: hanno-becker

README.md

@@ -8,7 +8,10 @@
 ![Proof: HOL-Light](https://github.com/pq-code-package/mlkem-native/actions/workflows/hol_light.yml/badge.svg)
 ![Benchmarks](https://github.com/pq-code-package/mlkem-native/actions/workflows/bench.yml/badge.svg)
 ![C90](https://img.shields.io/badge/language-C90-blue.svg)
-[![Apache](https://img.shields.io/badge/license-Apache--2.0-green.svg)](https://www.apache.org/licenses/LICENSE-2.0)
+
+[![License: Apache](https://img.shields.io/badge/license-Apache--2.0-green.svg)](https://www.apache.org/licenses/LICENSE-2.0)
+[![License: ISC](https://img.shields.io/badge/License-ISC-blue.svg)](https://opensource.org/licenses/ISC)
+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 
 mlkem-native is a secure, fast, and portable C90 implementation of ML-KEM[^FIPS203].
 It is a fork of the ML-KEM reference implementation[^REF].