common_language: Fix license in README.md
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{'url': 'https://api.github.com/repos/huggingface/datasets/pulls/3003', 'html_url': 'https://github.com/huggingface/datasets/pull/3003', 'diff_url': 'https://github.com/huggingface/datasets/pull/3003.diff', 'patch_url': 'https://github.com/huggingface/datasets/pull/3003.patch', 'merged_at': datetime.datetime(2021, 10, 4, 9, 27, 1)}
...it's correct elsewhere
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