git: add dr alias

.config/git/config

@@ -49,6 +49,8 @@
 	riu = rebase -i @{upstream}
 	# rebase interactive autosquash upstream
 	riau = rebase -i --autosquash @{upstream}
+	# diff the rebase
+	dr = range-diff @{u} @{1} @
 	ca = commit --amend
 	smash = "!git add -u && git ca --no-edit && git pf"
 	reset-head = remote set-head origin -a