Update README.md

README.md

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 license: "apache-2.0"
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-## CINO: Pre-trained Language Models for Chinese Minority
+## CINO: Pre-trained Language Models for Chinese Minority Languages
 
 Multilingual Pre-trained Language Model, such as mBERT, XLM-R, provide multilingual and cross-lingual ability for language understanding.
 We have seen rapid progress on building multilingual PLMs in recent year.