allow look up of convertible types also in nested maps

README.md

@@ -85,14 +85,15 @@ firebase firestore:delete [options] <<path>>
 
 #### For local JSON
 
-Usually the date, location & reference is not converted correctly when you backup the Firestore database. In order to import correctly, you have to pass to parameters for the options:
+Usually the date, location & reference are not converted correctly when you backup the Firestore database. In order to import correctly, you have to pass to parameters for the options:
 
 ```javascript
 // Import options
 const options = {
   dates: ['date1', 'date1.date2', 'date1.date2.date3'],
   geos: ['location', 'locations'],
   refs: ['refKey'],
+  nested: true // look up the data keys also in nested maps
 };
 ```
 

dist/import.d.ts

@@ -2,6 +2,7 @@ export interface IImportOptions {
     dates?: string[];
     geos?: string[];
     refs?: string[];
+    nested?: boolean;
 }
 /**
  * Restore data to firestore