Update README.md

Author: isarkis

README.md

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 # Cobalt [![Build Matrix](https://img.shields.io/badge/-Build%20Matrix-blueviolet)](https://github.com/youtube/cobalt/blob/main/BUILD_STATUS.md)
 
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 [![codecov](https://codecov.io/github/youtube/cobalt/branch/main/graph/badge.svg?token=RR6MKKNYNV)](https://codecov.io/github/youtube/cobalt)
 [![lint](https://github.com/youtube/cobalt/actions/workflows/lint.yaml/badge.svg?branch=main&event=push)](https://github.com/youtube/cobalt/actions/workflows/lint.yaml?query=event%3Apush+branch%3Amain)
 [![java](https://github.com/youtube/cobalt/actions/workflows/gradle.yaml/badge.svg?branch=main&event=push)](https://github.com/youtube/cobalt/actions/workflows/gradle.yaml?query=event%3Apush+branch%3Amain)