Add pointer to 0.55 notes from 0.56
v0.56

        * This is the first release to include the deprecations and backwards
          incompatibilities from 0.55. Please see that release's notes as
          well!
        * Skip parallel tests on Windows. This may be a bug in
          Test::Class::Moose or Parallel::ForkManager, but for now we're
          punting. Reported by Alexandr Ciornii. GitHub issue #36.
        * Removed Sub::Attribute from the "recommends" list. This is required
          now, and listing it as both required and recommends is confusing.
        * Lots of doc fixes.