Update README.md

README.md

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 ### Dataset Summary
 
-This a Hugging Face formatted dataset derived from the [Google UIBert dataset](https://github.com/google-research-datasets/uibert), which is in turn derived from the [RICO dataset](https://interactionmining.org/rico).
+This is a Hugging Face formatted dataset derived from the [Google UIBert dataset](https://github.com/google-research-datasets/uibert), which is in turn derived from the [RICO dataset](https://interactionmining.org/rico).
 
 ### Supported Tasks and Leaderboards