README.md: Use install.sh [Linux] (#489)
README.md: Use install.sh [Linux] (#489)

install.sh installs Ruby if necessary, and then installs Linuxbrew.
Linuxbrew/brew,maxim-belkin/brew,Linuxbrew/brew,hanxue/linuxbrew,hanxue/linuxbrew,maxim-belkin/brew,Linuxbrew/brew,hanxue/linuxbrew,maxim-belkin/brew,Linuxbrew/brew