rbenv/ruby-build v20200214

ruby-build 20200214

on GitHub

Fix TruffleRuby 19.3.0.2 definition

ruby 2.3 EOL

use correct key named warn_eol

remove unavailable jruby versions

add back withdifferent download source

add warn_eol

ruby 2.4 security maintenance

Add truffleruby-dev

• Uses the latest nightly, which is automatically built.

Make sure to install to a clean prefix

• Otherwise, existing files in the prefix could easily conflict and
  potentially cause very hard to debug errors.
• This is particularly important for *-dev builds which might be
  repeatedly installed to the same directory.