remove rdoc task

Rakefile

@@ -60,14 +60,6 @@ task :coverage do
   sh "open coverage/index.html"
 end
 
-require 'rake/rdoctask'
-Rake::RDocTask.new do |rdoc|
-  rdoc.rdoc_dir = 'rdoc'
-  rdoc.title = "#{name} #{version}"
-  rdoc.rdoc_files.include('README*')
-  rdoc.rdoc_files.include('lib/**/*.rb')
-end
-
 desc "Open an irb session preloaded with this library"
 task :console do
   sh "irb -rubygems -r ./lib/#{name}.rb"