Not supported in Ruby 2.1.6

[brupm]

rake derailer
rake aborted!
NotImplementedError: Parser does not support parsing Ruby 2.1.6

Tasks: TOP => derailer
(See full trace by running task with --trace)

[diego-]

This is a dependency issue from the sdg_utils gem using an old version of Parser (2.0.0). You can run derailer on newer ruby versions by using my fork which uses the newest version of Parser:
gem 'sdg_utils', :git => 'https://github.com/diego-/sdg_utils.git'

FYI @aleksandarmilicevic