[improvement] update lint rules (#3970)

src/count-down/index.js

@@ -117,7 +117,7 @@ export default createComponent({
     }
   },
 
-  render(h) {
+  render() {
     return (
       <div class={bem()}>
         {this.slots('default', this.timeData) || this.formattedTime}

src/count-down/test/index.spec.js

@@ -85,7 +85,7 @@ test('start method', async () => {
   wrapper.vm.start();
   wrapper.vm.start();
 
-  await later(20);
+  await later(50);
 
   const laterShapShot = wrapper.html();