Update failure tests README (#5197)
Update failure tests README (#5197)

* Update failure tests README

I keep finding this page when trying to run failure tests, so updating the README that way:
https://github.com/pypa/pipenv/issues/3363#issuecomment-452171564

Co-authored-by: Hanefi Onaldi <0178c92d98385629a148d24fadca233c25c57715@microsoft.com>

Co-authored-by: Hanefi Onaldi <0178c92d98385629a148d24fadca233c25c57715@microsoft.com>
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