This patch makes sure we only load relative code. Hence when coding or
testing rdoc, we'll be sure to always be using the correct code.
Discussion started at https://github.com/ruby/rdoc/pull/817.
Signed-off-by: Ulysse Buonomo <buonomo.ulysse@gmail.com>
https://github.com/ruby/rdoc/commit/aa41bd48eb
Co-authored-by: Nobuyoshi Nakada <nobu@ruby-lang.org>