message: fix mapping import
diff: @@ -6,7 +6,6 @@ import { IMetadataDictionary, SessionInfo, ConcurrencyCheckMode, StoreOptions }
  import { Todo, ObjectTypeDescriptor, PropsBasedObjectLiteralDescriptor, ClassConstructor } from "../../Types";
  import { SessionEventsEmitter, SessionBeforeStoreEventArgs, SessionBeforeDeleteEventArgs } from "./SessionEvents";
  import { RequestExecutor } from "../../Http/RequestExecutor";
  -import { ObjectMapper } from "../../Utility/Mapping";
  import { IDocumentStore } from "../IDocumentStore";
  import CurrentIndexAndNode from "../../Http/CurrentIndexAndNode";
  import { throwError, getError } from "../../Exceptions";
  