message: Update client interface for new subscription ID type (number)
diff: @@ -13,6 +13,6 @@ export interface IClient {
  refreshAllFromCache(): void;
  subscribe(
  callback: (changedTypes: string[], reponse: object) => void
  - ): string;
  - unsubscribe(id: string): void;
  + ): number;
  + unsubscribe(id: number): void;
  }
  