Manually merged from https://github.com/rubygems/rubygems/pull/2636

Enable Style/EmptyLinesAroundClassBody rubocop cop.

lib/rubygems/commands/sources_command.rb

@@ -5,6 +5,7 @@ require 'rubygems/spec_fetcher'
 require 'rubygems/local_remote_options'
 
 class Gem::Commands::SourcesCommand < Gem::Command
+
   include Gem::LocalRemoteOptions
 
   def initialize
@@ -219,4 +220,5 @@ To remove a source use the --remove argument:
       say "*** Unable to remove #{desc} source cache ***"
     end
   end
+
 end