Rubocop change

rubocop.rake

  desc 'Run RuboCop on the app and lib directories based on git diff'
  Rubocop::RakeTask.new('rubocop') do |task|

    cmd = 'git diff --name-only --diff-filter=ACMRTUXB ' \
          '$(git merge-base HEAD flux) ' \
          '| egrep \'\.rake$|\.rb$\''
    diff = `#{cmd}`

    # always include this file, if the patterns is empty it run everything
    patterns = ['lib/tasks/ci.rake']
    patterns += diff.split("\n")

    task.patterns = patterns.reject do |pattern|
      RUBOCOP_IGNORE.any? { |ignore_exp| ignore_exp.match(pattern) }
    end
    task.fail_on_error = true
  end