[racket-dev] Release Announcement for v5.3.1

On second thought, I think we should include all of the bullets
Vincent lists (below) and remove this one Matthew lists:

On Sun, Oct 28, 2012 at 9:42 AM, Matthew Flatt <mflatt at cs.utah.edu> wrote:
>  * The `for' form now supports `#:break' and `#:final' clauses.

Robby

On Sun, Oct 28, 2012 at 1:04 PM, Vincent St-Amour <stamourv at ccs.neu.edu> wrote:
> * The `#lang scheme' language is deprecated. `#lang racket' should be
>   used instead.
>
> * The `compatibility' collection provides features from Racket relatives,
>   such as `defmacro' and mutable lists. These features are provided to
>   ease porting code to Racket. We do not recommend using them in modern
>   Racket code.
>
> * NaN is included in all of Typed Racket's floating-point types, which
>   makes precise floating-point types easier to use.
>
> * Typed Racket provides the `:query-type/args' and `:query-type/result'
>   utilities to explore types at the REPL.
>
> * Screenshots of the widgets provided by the Racket GUI library are
>   included in the documentation. (Thanks to Diogo F. S. Ramos.)