Update README.md with license information

#1

We (01.AI) have updated our license from yi-license to apache-2.0.
Since apache-2.0 enables more free and flexible use and distribution, promoting open collaboration and innovation, we kindly advise that all Yi derivatives currently under the yi-license be updated to the apache-2.0 license.
Thanks for your understanding and cooperation.

waldie changed pull request status to merged

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