Merge pull request #2407 from mgalgs/gmt-compdef

Fix gmt compdef

plugins/git/git.plugin.zsh

@@ -100,7 +100,7 @@ compdef _git gvt=git verify-tag
 
 alias gpoat='git push origin --all && git push origin --tags'
 alias gmt='git mergetool --no-prompt'
-compdef _git gm=git-mergetool
+compdef _git gmt=git-mergetool
 
 alias gg='git gui citool'
 alias gga='git gui citool --amend'