lib/README: remove jcode.rb

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@14068 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/README

@@ -27,7 +27,6 @@ gserver.rb	general TCP server
 importenv.rb	imports environment variables as global variables
 ipaddr.rb	defines the IPAddr class
 irb.rb		interactive ruby
-jcode.rb	Japanese text handling (replace String methods)
 logger.rb	simple logging utility
 mailread.rb	reads mail headers
 mathn.rb	extended math operation