update d.ts

scripts/build-ts.js

@@ -9,7 +9,7 @@ const output = path.join(path.join(process.cwd(), `docs/assets/ts/artplayer.d.ts
 let code = '';
 for (let index = 0; index < types.length; index++) {
     const type = types[index];
-    code += String(fs.readFileSync(type)).replace(reg, '');
+    code += String(fs.readFileSync(type)).replace(reg, '') + '\n';
 }
 
 fs.writeFileSync(output, code.trim());