add prettier

packages/artplayer-template/react.js/src/App.js

@@ -1,23 +1,23 @@
-import React from "react";
-import Artplayer from "./ArtPlayer";
+import React from 'react';
+import Artplayer from './ArtPlayer';
 
 function App() {
-  return (
-    <div>
-      <Artplayer
-        option={{
-          url: "https://artplayer.org/assets/sample/video.mp4",
-          autoSize: true,
-        }}
-        style={{
-          width: "600px",
-          height: "400px",
-          margin: "60px auto 0",
-        }}
-        getInstance={(art) => console.log(art)}
-      />
-    </div>
-  );
+    return (
+        <div>
+            <Artplayer
+                option={{
+                    url: 'https://artplayer.org/assets/sample/video.mp4',
+                    autoSize: true,
+                }}
+                style={{
+                    width: '600px',
+                    height: '400px',
+                    margin: '60px auto 0',
+                }}
+                getInstance={(art) => console.log(art)}
+            />
+        </div>
+    );
 }
 
 export default App;