Fix typo in readme
Fix typo in readme

R.font.sanFransisco -> R.font.sanFrancisco
ntnmrndn/R.swift,tomasharkema/R.swift,ntnmrndn/R.swift,tomekc/R.swift,tomekc/R.swift,mac-cain13/R.swift,mac-cain13/R.swift,renrawnalon/R.swift,mac-cain13/R.swift,renrawnalon/R.swift,tomasharkema/R.swift