fix link

README.md

@@ -1,7 +1,7 @@
 ![License](https://img.shields.io/github/license/bioimage-io/spec-bioimage-io.svg)
 ![PyPI](https://img.shields.io/pypi/v/bioimageio-spec.svg?style=popout)
 ![conda-version](https://anaconda.org/conda-forge/bioimageio.spec/badges/version.svg)
-[![downloads](https://static.pepy.tech/badge/bioimageio.spec)](https://pepy.tech/project/black)
+[![downloads](https://static.pepy.tech/badge/bioimageio.spec)](https://pepy.tech/project/bioimageio.spec)
 [![conda-forge downloads](https://img.shields.io/conda/dn/conda-forge/bioimageio.spec.svg?label=conda-forge)](https://anaconda.org/conda-forge/bioimageio.spec/)
 ![code style](https://img.shields.io/badge/code%20style-black-000000.svg)