Enforce no empty lines around class body in rubygems

To normalize the code style with `bundler`.

lib/rubygems/commands/contents_command.rb

@@ -3,7 +3,6 @@ require 'rubygems/command'
 require 'rubygems/version_option'
 
 class Gem::Commands::ContentsCommand < Gem::Command
-
   include Gem::VersionOption
 
   def initialize
@@ -186,5 +185,4 @@ prefix or only the files that are requireable.
       [i, File.join(i, "specifications")]
     end.flatten
   end
-
 end