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

Enable Style/EmptyLinesAroundClassBody rubocop cop.

lib/rubygems/commands/rdoc_command.rb

@@ -5,6 +5,7 @@ require 'rubygems/rdoc'
 require 'fileutils'
 
 class Gem::Commands::RdocCommand < Gem::Command
+
   include Gem::VersionOption
 
   def initialize
@@ -92,4 +93,5 @@ Use --overwrite to force rebuilding of documentation.
       end
     end
   end
+
 end