[U-Boot] test/py: fix typos in README.md

[Tom Rini]

On Thu, Oct 19, 2017 at 07:08:52PM +0900, Masahiro Yamada wrote:

> Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>
> Reviewed-by: Stephen Warren <swarren at nvidia.com>

Applied to u-boot/master, thanks!

-- 
Tom
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