Use `inoremap` for calling Sparkup{,Next}().
Use `inoremap` for calling Sparkup{,Next}().

This will make the mapping work properly with e.g.
`noremap : .`.

See https://github.com/rstacruz/sparkup/pull/40#issuecomment-1202903

nixon/sparkup,rstacruz/sparkup,mandrigin/sparkup