code: def classes(delimiter)
        git = @dangerfile.git
        affected_files = git.modified_files + git.added_files
        affected_files.select { |file| files_extension.reduce(false) { |state, el| state || file.end_with?(el) } }
                      .map { |file| file.split('.').first.split(delimiter)[1] }
      end
docs: Select modified and added files in this PR