message: Export unsupported cursor from core
diff: @@ -4,6 +4,7 @@ import Readable from './readable';
  import Result from './result';
  import StitchTransport from './stitch-transport';
  import Transport from './transport';
  +import UnsupportedCursor from './unsupported-cursor';
  import Writable from './writable';
  export {
  @@ -13,5 +14,6 @@ export {
  Result,
  StitchTransport,
  Transport,
  + UnsupportedCursor,
  Writable,
  };
  