Update README - Append R-build dependencies `ubuntu`

[sdykae]

from https://stackoverflow.com/questions/17473547/error-with-readline-yes-default-and-headers-libs-are-not-available

sudo apt-get install build-essential
sudo apt-get install fort77
sudo apt-get install xorg-dev
sudo apt-get install liblzma-dev  libblas-dev gfortran
sudo apt-get install gcc-multilib
sudo apt-get install gobjc++
sudo apt-get install aptitude
sudo aptitude install libreadline-dev

from https://github.com/Jiefei-Wang/Painless-R-compilation-and-installation-on-Ubuntu Complete

sudo apt-get install build-essential fort77 xorg-dev liblzma-dev libblas-dev gfortran -y
sudo apt-get install gcc-multilib gobjc++ aptitude -y
sudo apt-get install libreadline-dev -y
sudo apt-get install libbz2-dev -y
sudo apt-get install libpcre2-dev -y
sudo apt-get install libcurl4 libcurl4-openssl-dev -y
sudo apt-get install default-jre -y  #optional if already have
sudo apt-get install default-jdk -y  #optional if already have
sudo apt-get install openjdk-8-jdk openjdk-8-jre -y  #optional if already have