black: add badge to README.md
				
					
				
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		| @@ -6,6 +6,7 @@ | ||||
| [](https://codecov.io/gh/spack/spack) | ||||
| [](https://github.com/spack/spack/actions/workflows/build-containers.yml) | ||||
| [](https://spack.readthedocs.io) | ||||
| [](https://github.com/psf/black) | ||||
| [](https://slack.spack.io) | ||||
|  | ||||
| Spack is a multi-platform package manager that builds and installs | ||||
|   | ||||
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	 Todd Gamblin
					Todd Gamblin