Merge pull request #414 from issyl0/readme_brew_linux_aws-vault

README: The aws-vault install command for Homebrew on Linux has changed

README.md

@@ -21,7 +21,7 @@ Check out the [announcement blog post](https://99designs.com.au/tech-blog/blog/2
 You can install aws-vault:
 - by downloading the [latest release](https://github.com/99designs/aws-vault/releases)
 - on macOS via [Homebrew Cask](https://github.com/caskroom/homebrew-cask) with `brew cask install aws-vault`
-- on Linux via [Homebrew on Linux](https://docs.brew.sh/Homebrew-on-Linux) with `brew install linuxbrew/extra/aws-vault`
+- on Linux via [Homebrew on Linux](https://docs.brew.sh/Homebrew-on-Linux) with `brew install aws-vault`
 - on Windows via [choco](https://chocolatey.org/packages/aws-vault) with `choco install aws-vault`
 - on Archlinux via the [AUR](https://aur.archlinux.org/packages/aws-vault/)
 - by compiling with `go get github.com/99designs/aws-vault`