clear danmaku after seeking

package.json

@@ -1,6 +1,6 @@
 {
   "name": "dplayer",
-  "version": "1.14.0",
+  "version": "1.14.1",
   "description": "Wow, such a lovely HTML5 danmaku video player",
   "main": "dist/DPlayer.min.js",
   "style": "dist/DPlayer.min.css",

src/danmaku.js

@@ -277,6 +277,7 @@ class Danmaku {
     }
 
     seek () {
+        this.clear();
         for (let i = 0; i < this.dan.length; i++) {
             if (this.dan[i].time >= this.options.time()) {
                 this.danIndex = i;