git: change alias d = diff; add alias ch = checkout

.gitconfig

@@ -2,7 +2,7 @@
 	lol = log --graph --decorate --oneline --all
 	lola = log --graph --decorate --pretty=oneline --abbrev-commit --all
 	st = status --short --branch
-	d = diff --stat
+	d = diff
 	dn = diff --name-status
 	ds = diff --stat
 	l = log --graph --decorate --oneline --all
@@ -10,6 +10,7 @@
 	ll = log --graph --decorate --pretty=format:'%C(yellow)%h %Cred%ad %Cgreen%d %Creset%s' --date=short --all
 	dw = diff -w
 	c = commit
+	ch = checkout
 
 [color]
 	ui = true