Rakefile in diffy-2.0.10 vs Rakefile in diffy-2.1.0

@@ -1,5 +1,9 @@
-require 'rake/rdoctask'
+begin
+  require 'rdoc/task'
+rescue LoadError
+  require 'rake/rdoctask'
+end
 require 'rubygems/package_task'
 require 'rspec/core/rake_task'
 
 task :default => :spec