Any way to change syntax for bold/italic in Neovim w/ vimwiki?

I’m very used to using asterisks for italics. In vimwiki they produce bold. I’d like to just switch around the characters used for bold, italics and/or both together. Where would I do this, and how can I do it in a way that won’t get overwritten when upgrading neovim?

OK, solution was to set syntax for .wiki files to markdown. That seems to have done the trick!