1.1.14 was causing #257, working versions tested include 1.99.1 and 2.0.0.  Specifying the same version requirements known to work with [rubocop](https://github.com/bbatsov/rubocop/commit/4ef259967e0b0938ea2732c250c3ee8346f0f4b7#diff-458bc38d82061cdac508dfb1be2b918bR29).