Jack Nagel 8c4e7ca5b5 Parse raw diff output in brew update
Using each_cons() "works", but to report all changes correctly we need
to look at the last elements even after we've looked at the last 3
consecutive elements.

Instead, let's parse each line of the raw diff output using a regexp.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
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