Update README.md

README.md

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 This dataset contains all MQM human annotations from [WMT Metrics Shared Tasks](https://wmt-metrics-task.github.io/) from 2020 to 2024.
 
-The data is organized into 8 columns:
+The data is organized into multiple columns, all containing the following columns:
 
 - lp: language pair
 - src: input text
 - mt: translation
 - ref: reference translation
-- score: MQM score
-- system: MT Engine that produced the translation
-- annotators: number of annotators
-- domain: domain of the input text (e.g. news)
-- year: collection year
 
 This dataset is taken directly from the original [WMT repository](https://github.com/google/wmt-mqm-human-evaluation).