Add alias for 'git rebase develop' (#6006)

plugins/git/git.plugin.zsh

@@ -208,6 +208,7 @@ alias gra='git remote add'
 alias grb='git rebase'
 alias grba='git rebase --abort'
 alias grbc='git rebase --continue'
+alias grbd='git rebase develop'
 alias grbi='git rebase -i'
 alias grbm='git rebase master'
 alias grbs='git rebase --skip'