Update README.md

HugoLaurencon · web-flow · commit 63edbb3f6ee0 · 2022-06-13T14:56:59.000+02:00
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+# WARNING - THIS REPO WILL NO LONGER BE MAINTAINED, CHECK https://github.com/bigscience-workshop/data-preparation/tree/main/preprocessing/filtering INSTEAD
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 ## Big Science - Automated Classification & Dataset Curation - AC⚡️DC
 
 This is the data filtering code for BigScience.
