Make sure the returned message is utf-8
Make sure the returned message is utf-8

This prevents a backtrace in the case where you would do "@foo, what's
up with a – b"? in a message, i.e, where there was both something to
be unfurled as well as a non-ASCII character in the string.

wee-slack/wee-slack,scharfie/wee-slack,trygveaa/wee-slack,megalithic/wee-slack,rawdigits/wee-slack