fix(core): update

ts/dees-element.plugins.ts

@@ -1,6 +1,7 @@
-import { LitElement } from 'lit-element';
+import { LitElement, property } from 'lit-element';
 const litElement = {
-  LitElement
+  LitElement,
+  property
 };
 
 import * as domtools from '@designestate/dees-domtools';

ts/index.ts

@@ -9,7 +9,7 @@ export {
 } from 'lit-element';
 
 export class DeesElement extends plugins.litElement.LitElement {
-
+  @plugins.litElement.property({type: Boolean})
   public goBright: boolean = false;
   public domtoolsPromise = plugins.domtools.elementBasic.setup(this);