change to base to remove obsolete todo

Hello, This is my first library patch. It's probably a bit silly to follow the full process on such a simple patch, but it does give me a chance to practice the policy. http://hackage.haskell.org/trac/ghc/ticket/3939 Should there be a timescale field on the ticket for following this step of the process? Did I overlook it? "Tracking. Add a Trac ticket of type proposal for the appropriate library component, with a timescale for consideration (to focus the community's attention for a limited period), adding the patch file as an attachment." I'm thinking one week should be reasonable for such a simple change. Thanks, Jason