v8.2.0

Minor Changes

• add collaboration comments client (@alpha) (#1235) (5906f72)

• add variant actions (#1279) (dd25720)

  Adds CreateVariantAction, EditVariantAction, DeleteVariantAction, PublishVariantAction and
  UnpublishVariantAction, along with a VariantAction union, covering the
  sanity.action.document.variant.* actions. They are included in the Action union, so
  client.action() accepts them.

  Each action addresses a variant document by the publishedId, variantId and bundleId triple
  rather than by document ID, since the API derives the document ID from those three values.

  Note that Action widening is a breaking change for code that exhaustively switches on
  Action['actionType'] with a never fallthrough, which will need to handle the new cases.