title: I cannot update Ruby on Homebrew from 2.0.0 to 2.3.1
body: <p>I am trying to upgrade Ruby because I need to setup a Jekyll template, and I need to latest version to do it. Since I have a Mac running Sierra, I already have Ruby preinstalled as well as the Homebrew installation. When I install it using <code>brew install ruby</code>, it works, but when I check the version, it is still at 2.0.0 instead of 2.3.1 where it should be. Homebrew says I have 2.3.1, but the CLI says I have 2.0.0. I tried to use <code>brew link --override ruby</code> to make it work, but it said everything was working and it got me nowhere.</p>