Rakefile in cucumber-0.9.0 vs Rakefile in cucumber-0.9.1

@@ -7,6 +7,6 @@
 Dir['gem_tasks/**/*.rake'].each { |rake| load rake }
 
 task :default => [:spec, :cucumber]
 
 require 'rake/clean'
-CLEAN.include %w(**/*.{log,pyc})
+CLEAN.include %w(**/*.{log,pyc,rbc})