Update README.md

Author: KalinNonchev

README.md

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-[![Downloads](https://static.pepy.tech/badge/gnomad-db)](https://pepy.tech/project/gnomad-db)
+[![KalinNonchev](https://circleci.com/gh/KalinNonchev/gnomAD_DB.svg?style=shield)](https://app.circleci.com/insights/github/KalinNonchev/gnomAD_DB?reporting-window=last-24-hours) [![Downloads](https://static.pepy.tech/badge/gnomad-db)](https://pepy.tech/project/gnomad-db)
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 # gnomAD_DB
 
 ### Changelog