Diminish GitGutter from status line
Diminish GitGutter from status line

The `:diminish` by default use name of the package with added `-mode` to
automatically detect what to remove. However, in a case of `git-gutter-fringe`
we use `git-gutter-mode` and this was not working as intended, leaving
`GitGutter` in the status line. Fix this by explicitly providing minor mode symbol.

steve-downey/dot.emacs,psipika/exordium,pkryger/exordium,philippe-grenet/exordium