rubocop.rake in nanoc-4.0.1

- old
+ new

@@ -1,6 +1,6 @@
 require 'rubocop/rake_task'
 
 RuboCop::RakeTask.new(:rubocop) do |task|
   task.options  = %w( --display-cop-names --format simple )
-  task.patterns = ['lib/**/*.rb']
+  task.patterns = ['bin/nanoc', 'lib/**/*.rb', 'spec/**/*.rb', 'test/**/*.rb']
 end