Add note on keeping local tools up to date

Author: xt0rted

README.md

@@ -25,6 +25,11 @@ dotnet tool install run-script
 > PowerShell defines the alias `r` for the `Invoke-History` command which prevents this from being called.
 > You'll also run into issues calling this from your scripts since global tools don't use the `dotnet` prefix.
 
+## Keeping current
+
+Tools like [Dependabot](https://github.com/apps/dependabot) (https://github.com/github/feedback/discussions/13825) and [Renovate](https://github.com/marketplace/renovate) don't currently support updating dotnet local tools.
+One way to automate this is to use a [GitHub Actions workflow](https://github.com/xt0rted/dotnet-tool-update-test) to check for updates and create PRs when new versions are available, which is what this repo does.
+
 ## Options
 
 Name | Description