style: update

src/component/dropdown/index.less

@@ -15,6 +15,7 @@
   background-color: #fff;
   box-sizing: border-box;
   border: 1px solid #e4e7ed;
+  border-radius: 2px;
   box-shadow: 0 2px 12px 0 rgba(0, 0, 0, .1);
 }
 

src/component/transition/index.ts

@@ -5,4 +5,4 @@ Component.install = (app: App) => {
   app.component(Component.name, Component);
 };
 
-export default Component;
+export default Component;