For CountryPicker return CountryCode object instead of String

Author: danvick

lib/flutter_form_builder.dart

@@ -1,5 +1,6 @@
 library flutter_form_builder;
 
+export 'package:country_code_picker/country_code_picker.dart';
 export 'package:flutter_typeahead/flutter_typeahead.dart';
 export 'package:signature/signature.dart';
 

lib/src/fields/form_builder_country_picker.dart

@@ -104,7 +104,7 @@ class FormBuilderCountryPicker extends FormBuilderField {
               ),
               child: CountryCodePicker(
                 onChanged: (CountryCode e) {
-                  state.didChange(e.toString());
+                  state.didChange(e);
                 },
                 initialSelection: initialSelection,
                 showCountryOnly: showOnlyCountryWhenClosed,

lib/src/fields/form_builder_phone_field.dart

@@ -23,7 +23,6 @@ class FormBuilderPhoneField extends FormBuilderField {
   final ValueChanged onChanged;
   @override
   final ValueTransformer valueTransformer;
-
   @override
   final bool autovalidate;
   final int maxLines;