refactor: Update build timestamp in Artplayer

docs/assets/example/canvas.js

@@ -0,0 +1,8 @@
+// npm i artplayer-plugin-canvas
+// import ArtplayerPluginCanvas from 'artplayer-plugin-canvas';
+
+var art = new Artplayer({
+    container: '.artplayer-app',
+    url: '/assets/sample/video.mp4',
+    Canvas: ArtplayerPluginCanvas,
+});