Rubocop 0.53 introduces some breaking changes. This style guide is affected in following aspects:
Style/TrailingCommaInLiteral is replaced with Style/TrailingCommaInArrayLiteral, and Style/TrailingCommaInHashLiteral Lint/ConditionPosition is moved to Layout namespace Lint/UnneededDisable is renamed as Lint/UnneededCopDisableDirective
Full changelog: https://github.com/bbatsov/rubocop/blob/master/CHANGELOG.md#0530-2018-03-05
See also: https://github.com/thoughtbot/guides/pull/510
Closes #1113 (closed).