Update test

Author: jasongrout

packages/base/test/src/widget_test.ts

@@ -602,10 +602,10 @@ describe('WidgetModel', function() {
       expect(this.widget.get_state()).to.deep.equal({
         _model_module: '@jupyter-widgets/base',
         _model_name: 'WidgetModel',
-        _model_module_version: '1.2.0',
+        _model_module_version: '2.0.0',
         _view_module: '@jupyter-widgets/base',
         _view_name: null,
-        _view_module_version: '1.2.0',
+        _view_module_version: '2.0.0',
         _view_count: null,
         a: 'get_state test'
       });