restrict rubocop to 0.50.0 and set Ruby parser to 2.0 #283
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This PR is a bit nitpicky, so feel free to close this. I noticed that in
.travis.yml
that ruby 2.0 is being tested. It would be great to set rubocop to match the lowest supported version so that Rubocop doesn't suggests a change that Ruby 2.0 doesn't support