[racket-dev] Release Announcement for v5.3

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> james:
>  - added would-be-future (a5676e9a)
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Would-be-future is a special type of future that always executes
sequentially and records all potential barricades a regular future would
encounter.


>  - added futures visualizer (b6f71ec4)
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The futures visualizer is a graphical profiling tool for parallel programs
using futures.  The tool shows a detailed execution timeline depicting the
migration of futures between threads, and gives detailed information about
each runtime synchronization that occurred during program execution.
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