Add proper link to downloads badge
[![Build Status](https://github.com/petercorke/robotics-toolbox-python/workflows/build/badge.svg?branch=master)](https://github.com/petercorke/robotics-toolbox-python/actions?query=workflow%3Abuild)
[![Coverage](https://codecov.io/gh/petercorke/robotics-toolbox-python/branch/master/graph/badge.svg)](https://codecov.io/gh/petercorke/robotics-toolbox-python)
[![Language grade: Python](https://img.shields.io/lgtm/grade/python/g/petercorke/robotics-toolbox-python.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/petercorke/robotics-toolbox-python/context:python)
-![pypi downloads](https://img.shields.io/pypi/dw/roboticstoolbox-python)
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+[![PyPI - Downloads](https://img.shields.io/pypi/dw/roboticstoolbox-python)](https://pypistats.org/packages/roboticstoolbox-python)
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