Add helpful section upgrading to MT6 #828
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Add section explaining use of ffast to help migrate code easily to the new expectation sequence.
I recently migrated our version of Minitest on a very large codebase and we've been hit with a ton of DEPRECATED warnings.
Relying on AST transformation is a great way to easily migrate the codebase to use the new style.
There are even more advanced concepts in the fast library such as "experiments"; which can run minitest following every change. The amount documented here should be a great starting point for others thought!