Do not suggest use of deprecated brew cask reinstall

[Luthaf]

• Have you followed the guidelines in our Contributing document?
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• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
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I got a warning Warning: Calling brew cask reinstall is deprecated! Use brew reinstall instead. after copy-pasting a suggestion from brew cask install, so I corrected the suggestion. Let me know if I should write tests for this!

[MikeMcQuaid]

Thanks so much for your first contribution! Without people like you submitting PRs we couldn't run this project. You rock, @Luthaf!