add git last alias

gitconfig

@@ -20,6 +20,7 @@
     diffstat = diff --stat -r
     lg = log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit --date=relative
     fix = "!f() { ${EDITOR} $(git diff --name-only | uniq ); }; f"
+    last = "!l() { ${EDITOR} $(git diff-tree --no-commit-id --name-only -r HEAD ); }; l"
 [merge]
     tool = bc3
 [mergetool]