Update README.md

README.md

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 license: cc-by-nc-sa-4.0
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 ## Introduction
-This dataset is extracted by postprocessing data from Náplava et al., 2019. Specificially, we extract gramatically incorrect sentences, and their respective corrections.
+This dataset is extracted by postprocessing data from Náplava et al., 2019. Specificially, we extracted gramatically incorrect sentences, and their respective corrections.
 Then we convert task to binary detection of errorneous sentences. We downloaded the original dataset from [LINDAT-Clarin repository](https://lindat.mff.cuni.cz/repository/xmlui/handle/11234/1-3057).