Removing minitest dependency line from Gemfile

[jonrohan]

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What are you trying to accomplish?

Cleaning up the Gemfile noticed this line was meant to be temporary. The issue is resolved so removing the line freerange/mocha#614

  # Disallow v5.19 for now since it breaks mocha.
  # See: https://github.com/freerange/mocha/issues/614
  # Remove this line when mocha has fixed the issue
  gem "minitest", "< 5.22"

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