Deprecate initialValue for Signature field. There's no easy way of converting Uint8List to List<Point>

Author: danvick

lib/flutter_form_builder.dart

@@ -1,6 +1,7 @@
 library flutter_form_builder;
 
 export 'package:flutter_typeahead/flutter_typeahead.dart';
+export 'package:signature/signature.dart';
 
 export './src/fields/form_builder_checkbox.dart';
 export './src/fields/form_builder_checkbox_list.dart';

lib/src/fields/form_builder_signature_pad.dart

@@ -9,6 +9,8 @@ import 'package:signature/signature.dart';
 class FormBuilderSignaturePad extends StatefulWidget {
   final String attribute;
   final List<FormFieldValidator> validators;
+  @Deprecated('There is currently no way of converting Uint8List to List<Point> - https://github.com/4Q-s-r-o/signature/issues/17.'
+      'To Pass a list of points is initial value use `SignatureController`.')
   final Uint8List initialValue;
   final bool readOnly;
   final InputDecoration decoration;