v1.6.1+31

如果在日志中发现了数据库表不存在等问题，卸载当前app重装即可。
If you find errors like table doesn't exist in logs, please uninstall current app and re-install.

1. 阅读页面增加缩略图功能
2. 修复CupertinoPicker颜色问题与文字居中问题
3. 尝试修复退出阅读页面时发生的一些异常

1. Show thumbnails in read page
2. Fix bug with CupertinoPicker in read setting
3. Try to fix bug when exit read page