fix: send valid JSON on bulk/done

Closes #38

src/bulk.ts

@@ -78,6 +78,6 @@ export class Bulk<T extends SCThings> {
   async done(): Promise<SCBulkDoneResponse> {
     return this.client.invokeRoute<SCBulkDoneResponse>(this.bulkDoneRoute, {
       UID: this.bulkResponse.uid,
-    });
+    }, {});
   }
 }