Strip trailing new lines from yml-govspeak input
Strip trailing new lines from yml-govspeak input

This was causing false-positives in the Smartdown transition
comparison tool, where YML content had (many) extra trailing
new lines.

They should be non-content affecting, so this won't
change any rendering behaviour, but will normalise the output

ministryofjustice/smart-answers,askl56/smart-answers,aledelcueto/smart-answers,tadast/smart-answers,stwalsh/smart-answers,alphagov/smart-answers,ministryofjustice/smart-answers,lutgendorff/smart-answers,stwalsh/smart-answers,alphagov/smart-answers,lutgendorff/smart-answers,tadast/smart-answers,lutgendorff/smart-answers,askl56/smart-answers,askl56/smart-answers,tadast/smart-answers,lutgendorff/smart-answers,tadast/smart-answers,aledelcueto/smart-answers,ministryofjustice/smart-answers,aledelcueto/smart-answers,stwalsh/smart-answers,stwalsh/smart-answers,aledelcueto/smart-answers,askl56/smart-answers,alphagov/smart-answers,alphagov/smart-answers