Update README.md

Co-authored-by: Matthew John Cheetham <[email protected]>

Author: wolf99

README.md

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-[Git Credential Manager][gcm] (GCM) is a secure Git credential helper built on [.NET][] that runs on Windows, macOS, and Linux.
+[Git Credential Manager][gcm] (GCM) is a secure Git credential helper built on [.NET][dotnet] that runs on Windows, macOS, and Linux.
 
 Compared to Git's [built-in credential helpers][git-tools-credential-storage] (Windows: wincred, macOS: osxkeychain, Linux: gnome-keyring/libsecret) which provides single-factor authentication support working on any HTTP-enabled Git repository, GCM provides multi-factor authentication support for [Azure DevOps][], Azure DevOps Server (formerly Team Foundation Server), GitHub, and Bitbucket.