Use TrailingCommaInLiteral
Use TrailingCommaInLiteral

TrailingCommaInArrayLiteral and TrailingCommaInHashLiteral were introduced in v0.53.0 and we're running v0.49.0.

https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md#0530-2018-03-05

Shopify/liquid,locomotivecms/liquid