Update SETUP file, add missing instruction.
Update SETUP file, add missing instruction.

apt-get update must be run after modifying the ppa's sources.list file.

yohanboniface/memopol-core,stfp/memopol2,yohanboniface/memopol-core,yohanboniface/memopol-core,stfp/memopol2,stfp/memopol2