Lint README (#1300)

README.md

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 [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/jupyterlab/jupyterlab-git/main?urlpath=lab/tree/examples/demo.ipynb) [![Github Actions Status](https://github.com/jupyterlab/jupyterlab-git/actions/workflows/build.yml/badge.svg)](https://github.com/jupyterlab/jupyterlab-git/actions/workflows/build.yml) [![Version](https://img.shields.io/npm/v/@jupyterlab/git.svg)](https://www.npmjs.com/package/@jupyterlab/git) [![Version](https://img.shields.io/pypi/v/jupyterlab-git.svg)](https://pypi.org/project/jupyterlab-git/) [![Downloads](https://img.shields.io/npm/dm/@jupyterlab/git.svg)](https://www.npmjs.com/package/@jupyterlab/git) [![Version](https://img.shields.io/conda/vn/conda-forge/jupyterlab-git.svg)](https://anaconda.org/conda-forge/jupyterlab-git) [![Downloads](https://img.shields.io/conda/dn/conda-forge/jupyterlab-git.svg)](https://anaconda.org/conda-forge/jupyterlab-git)<!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
 [![All Contributors](https://img.shields.io/badge/all_contributors-30-orange.svg?style=flat-square)](#contributors-)
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 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 A JupyterLab extension for version control using Git