Update README.md with license information (#4)

- Update README.md with license information (8bc0ffd256fcdd331b1f6d896b0810285062316e)


Co-authored-by: Chen Chongyu <[email protected]>

README.md

@@ -1,5 +1,5 @@
 ---
-license: llama2
+license: apache-2.0
 ---
 ---
 license: gemma