[rubygems/rubygems] No reason for Definition#sources to be private

https://github.com/rubygems/rubygems/commit/432fe083a6

lib/bundler/definition.rb

@@ -19,7 +19,8 @@ module Bundler
       :ruby_version,
       :lockfile,
       :gemfiles,
-      :locked_checksums
+      :locked_checksums,
+      :sources
     )
 
     # Given a gemfile and lockfile creates a Bundler definition
@@ -500,8 +501,6 @@ module Bundler
 
     private
 
-    attr_reader :sources
-
     def should_add_extra_platforms?
       !lockfile_exists? && generic_local_platform_is_ruby? && !Bundler.settings[:force_ruby_platform]
     end

lib/bundler/lockfile_generator.rb

@@ -29,7 +29,7 @@ module Bundler
     private
 
     def add_sources
-      definition.send(:sources).lock_sources.each_with_index do |source, idx|
+      definition.sources.lock_sources.each_with_index do |source, idx|
         out << "\n" unless idx.zero?
 
         # Add the source header