boot.rb in ros-apartment-2.4.0

- old
+ new

@@ -1,11 +1,13 @@
+# frozen_string_literal: true
+
 require 'rubygems'
 
-gemfile = File.expand_path('../../../../Gemfile', __FILE__)
+gemfile = File.expand_path('../../../Gemfile', __dir__)
 
 if File.exist?(gemfile)
   ENV['BUNDLE_GEMFILE'] = gemfile
   require 'bundler'
   Bundler.setup
 end
 
-$:.unshift File.expand_path('../../../../lib', __FILE__)
\ No newline at end of file
+$LOAD_PATH.unshift File.expand_path('../../../lib', __dir__)