Add comment to Pinfile about dependency on Mapit
Add comment to Pinfile about dependency on Mapit

We add a comment to :publisher to inform about the occasional dependency on Mapit.
Publisher only uses Mapit in limited areas, so we do not add Mapit as an explicit dependency, but still want to make future readers aware of that they may have to start the app locally.

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet