Update changelog with entry for gulp executable issue
Update changelog with entry for gulp executable issue

Signed-off-by: Mike Shaw <c2a7ce690d14ad2328dcadcb63748f84bc5cb110@dwp.gsi.gov.uk>

alphagov/govuk_prototype_kit,alphagov/govuk_prototype_kit,dwpdigitaltech/hrt-prototype,alphagov/govuk_prototype_kit,dwpdigitaltech/hrt-prototype,dwpdigitaltech/hrt-prototype