v0.7.1

Changed

• Adopted drf-services' stable dispatch surface (the sister repo's
  SURF-1 / 0.17). All dispatch-leaf imports — run_service,
  arun_service, is_async, resolve_callable_kwargs, run_selector,
  arun_selector, is_queryset, apply_queryset_shaping — now come from
  the rest_framework_services package root (the documented, semver-stable
  surface) instead of private _compat modules and internal utils paths.
  No behaviour change.
• Dependency range bumped to djangorestframework-services>=0.17,<0.18 —
  required, since 0.17 removed the private _compat package this package
  previously imported from.