Update setup instructions
Update setup instructions

Include Java8 requirement for the butterknife usage.

JakeWharton/butterknife,hzsweers/butterknife,JakeWharton/butterknife,JakeWharton/butterknife,ze-pequeno/butterknife,JakeWharton/butterknife,ze-pequeno/butterknife,hzsweers/butterknife,ze-pequeno/butterknife,hzsweers/butterknife,ze-pequeno/butterknife