Update Rubocop for Travis builds to 0.29.0
Update Rubocop for Travis builds to 0.29.0

Change-Id: Iebb7a283b4150d4ad0116ae11f00a908fc86bf0b
Reviewed-on: http://gerrit.causes.com/46290
Tested-by: jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@brigade.com>
Reviewed-by: Shane da Silva <67fb7bfe39f841b16a1f86d3928acc568d12c716@brigade.com>

artemartemov/scss-lint-hdm