Can't create poll with some Chinese options

[sam (Sam Saffron)]

@chenyxuan

I fixed this by forcing a conversion to UTF-8 “bytes” and made a PR to your official repo.

Thank You!

FIX: Force string conversions to UTF-8 "bytes"

Change looks safe, but we need to confirm that there are no backwards compatibility concerns here. @zogstrip can you have a quick look at the PR?