Add todo item + moved comment

README.md

@@ -131,3 +131,4 @@ TODO / bugs
   it is better than putting everything at the end.
 - `border:none` could be `border:0`, or in general any shorthand that has both
   a `style` and `width` property should be transformed from `none` into `0`.
+- Automated test suite: auto-diff css files and expected minified versions.

types.ml

@@ -27,8 +27,8 @@ and pseudo_class_arg =
   | Nth of nth
 and nth =
   | Even | Odd
-  (* a and b in an+b *)
   | Formula of int * int
+  (* a and b in an+b *)
 
 type media_expr = string * expr option
 type media_query = string option * string option * media_expr list