Update libconfuse install directions for Mac
Update libconfuse install directions for Mac

Homebrew is now using the latest and greatest.

edahlseng/fwup,fhunleth/fwup,fhunleth/fwup,michaelkschmidt/fwup,edahlseng/fwup,fhunleth/fwup,michaelkschmidt/fwup,michaelkschmidt/fwup