Add Release Note (bug): Git for Windows used [to issue a misleading warning when .gitignore was a directory](https://github.com/git-for-windows/git/issues/5068), which has been [fixed](https://github.com/git-for-windows/git/pull/5342).

Add Release Note (bug): Git for Windows used [to issue a misleading warning when .gitignore was a directory](https://github.com/git-for-windows/git/issues/5068), which has been [fixed](https://github.com/git-for-windows/git/pull/5342). #162