Update README.md

Author: shntnu

README.md

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 # StarryNight
 
-[![Tests](https://github.com/broadinstitute/starrynight/actions/workflows/test.yml/badge.svg)](https://github.com/broadinstitute/starrynight/actions/workflows/test.yml)
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 A toolkit for processing, analyzing, and managing optical pooled screening (OPS) image data.
 
 See [docs/](docs/) or <https://broadinstitute.github.io/starrynight/> for documentation.