emoji is not support

[sunyongsheng]

When the post's content has emoji, the export doestn't work well. The emoji will be replace by '?', hope add supporting of emohi

[lonekorean]

I gave it a try with some emojis in post content. Looks like they came through just fine.

I'm going to close the issue, but feel free to reopen if you are still able to repro or have new info. Thanks!