Update README.md with license information

Hi, I'm Chen, a DevRel specialist from 01.AI.
We have updated our license from yi-license to apache-2.0, and this PR is about the update for your model.
Apache-2.0 enables more free and flexible use and distribution, promoting open collaboration and innovation.
If it looks good to you, you can update other Yi model derivatives now licensed under yi-license to apache-2.0.
Thanks for your understanding and cooperation.

README.md

@@ -2,15 +2,12 @@
 language:
 - en
 - ko
-license: other
 library_name: transformers
 tags:
 - pytorch
 - Yi-Ko
 - 01-ai
 - Yi
-license_name: yi-license
-license_link: LICENSE.md
 extra_gated_heading: Access beomi/Yi-Ko-6B on Hugging Face
 extra_gated_button_content: Submit
 extra_gated_fields:
@@ -123,6 +120,7 @@ model-index:
     source:
       url: https://huggingface.co/spaces/HuggingFaceH4/open_llm_leaderboard?query=beomi/Yi-Ko-6B
       name: Open LLM Leaderboard
+license: apache-2.0
 ---
 
 > Update @ 2024.01.29 New Model [beomi/Yi-Ko-DUS-9B](https://huggingface.co/beomi/Yi-Ko-DUS-9B) Released! 🎉