Update Rubocop from 0.26.0 -> 0.26.1 for Travis builds
Update Rubocop from 0.26.0 -> 0.26.1 for Travis builds

Change-Id: I8342d80e2de8dac5e088259ec6ef8f3a28e8343d
Reviewed-on: http://gerrit.causes.com/42990
Tested-by: jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@causes.com>
Reviewed-by: Shane da Silva <67fb7bfe39f841b16a1f86d3928acc568d12c716@brigade.com>

mzp/haml-lint,skateman/haml-lint