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 on your own.
Thanks for your understanding and cooperation.

README.md

@@ -1,9 +1,6 @@
 ---
 base_model: 01-ai/Yi-6B
 inference: false
-license: other
-license_link: LICENSE
-license_name: yi-license
 model_creator: 01-ai
 model_name: Yi 6B
 model_type: yi
@@ -11,6 +8,7 @@ prompt_template: 'Human: {prompt} Assistant:
 
   '
 quantized_by: jezzarax
+license: apache-2.0
 ---
 <!-- markdownlint-disable MD041 -->