v1.0.0-beta.6

⚠️ Breaking Changes

• Change Resource\Paginatable::paginate() signature to accept the resolved
  offset and limit integers (plus the request context) and return the page of
  results instead of mutating the query in place
• New contract for custom Pagination implementations:
  • Add paginate(object $query, Context $context): Page method which should
    return a page of results
  • Remove meta and links methods; set this data in paginate via the
    Context object
• Resource\\Listable implementations must now provide defaultSort() and
  pagination() methods so defaults can be reused when listing related data
• Refactor Serializer so it is instantiated without a Context and expects
  the resource context to be provided to addPrimary() / addIncluded()

Added

• Add cursor pagination support via Endpoint\Index::cursorPaginate() and the
  Resource\CursorPaginatable contract, following the
  ethanresnick/cursor-pagination JSON:API profile
• Allow exceptions to attach meta and links members to the error response
• Add Context::$documentMeta and Context::$documentLinks as ArrayObject
  instances to allow callbacks to add meta information to the response document
• Support JSON:API relationship URLs via the Show endpoint, adding automatic
  self / related links, and paginated/filterable/sortable to-many responses
  when the related resource is Listable
• Allow the Update endpoint to handle PATCH / POST / DELETE requests to
  relationship URLs and return the updated relationship document
• Implement the Resource\Attachable contract and add ToMany::attachable(),
  validateAttach(), and validateDetach() helpers for controlling
  relationship mutation endpoints with attach/detach hooks
• Introduce Endpoint\ResourceEndpoint and Endpoint\RelationshipEndpoint so
  endpoints can contribute relationship and resource links during serialization