Add upstack alias

Author: flyinggrizzly

lib/aliases

@@ -34,3 +34,5 @@ alias ggone="git branch -vv | grep ': gone' | cut -c 3- | awk '{ print \$1 }'"
 alias grc="git rebase --continue"
 
 (( $+commands[bundle] )) && alias be='bundle exec'
+
+alias upstack="gt submit --stack --update-only"