Update README.md

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Author: jeromekelleher

README.md

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 [![CI](https://github.com/sgkit-dev/bio2zarr/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/sgkit-dev/bio2zarr/actions/workflows/ci.yml)
 [![Coverage Status](https://coveralls.io/repos/github/sgkit-dev/bio2zarr/badge.svg)](https://coveralls.io/github/sgkit-dev/bio2zarr)
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-![PyPI - Downloads](https://img.shields.io/pypi/dm/bio2zarr)
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 # bio2zarr
 Convert bioinformatics file formats to Zarr