Update README.md (#23213)

2021-03-09 09:24:50 -06:00 · 2021-03-09 09:24:50 -06:00 · 0ae85f139b
--- a/README.md
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 # .NET Docs

-![Markdownlint](https://github.com/dotnet/docs/workflows/Markdownlint/badge.svg)
+![Markdownlint](https://github.com/dotnet/docs/workflows/Markdownlint/badge.svg) [![target supported version](https://github.com/dotnet/docs/actions/workflows/version-sweep.yml/badge.svg)](https://github.com/dotnet/docs/actions/workflows/version-sweep.yml)

 This repository contains the conceptual documentation for .NET. The [.NET documentation site](https://docs.microsoft.com/dotnet) is built from multiple repositories in addition to this one: