code: def minor_releases(self, manager):
          
          # TODO: yea deffo need a real object for 'manager', heh. E.g. we do a
          # very similar test for "do you have any actual releases yet?"
          # elsewhere. (This may be fodder for changing how we roll up
          # pre-major-release features though...?)
          return [
              key for key, value in six.iteritems(manager)
              if any(x for x in value if not x.startswith('unreleased'))
          ]
docs: Return all minor release line labels found in ``manager``.