When docs are included, returned objects are expected to be documents (#153)

diff --git a/lib/nano.d.ts b/lib/nano.d.ts
index 5c165c5..4175bb1 100644
--- a/lib/nano.d.ts
+++ b/lib/nano.d.ts
@@ -1175,7 +1175,7 @@
       id: string;
       key: string;
       value: V;
-      doc?: D;
+      doc?: D & Document;
     }>;
 
     // Number of documents in the database/view.