Update the govuk-lint to version 0.6.2
Update the govuk-lint to version 0.6.2

Apply the latest govuk-lint cops to smart answers, to include sass/scss 
linting as well as a bug fix.
stwalsh/smart-answers,aledelcueto/smart-answers,aledelcueto/smart-answers,alphagov/smart-answers,aledelcueto/smart-answers,stwalsh/smart-answers,alphagov/smart-answers,alphagov/smart-answers,alphagov/smart-answers,stwalsh/smart-answers,stwalsh/smart-answers,aledelcueto/smart-answers