[U-Boot] README: Explain how to generate the CHANGELOG file.

[Tom Rini]

On Wed, Nov 14, 2012 at 02:03:20AM -0000, Robert P. J. Day wrote:

> Since the top-level README file refers the reader to the CHANGELOG,
> it's worth mentioning how to generate it.
> 
> Signed-off-by: Robert P. J. Day <rpjday at crashcourse.ca>

Applied to u-boot/master, thanks!

-- 
Tom
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