Fix lint error

Author: jeromewu

src/browser/index.js

@@ -1,5 +1,5 @@
 const defaultOptions = require('./defaultOptions');
-const {getCreateFFmpegCore} = require('./getCreateFFmpegCore');
-const {fetchFile} = require('./fetchFile');
+const { getCreateFFmpegCore } = require('./getCreateFFmpegCore');
+const { fetchFile } = require('./fetchFile');
 
-export {defaultOptions, getCreateFFmpegCore, fetchFile};
+export { defaultOptions, getCreateFFmpegCore, fetchFile };