WARNING: 'require 'rake/rdoctask'' is deprecated

[redic]

After 'rake' ! get warning:

WARNING: 'require 'rake/rdoctask'' is deprecated. Please use 'require 'rdoc/task' (in RDoc 2.4.2+)' instead.
But .js was generated fine.

I change:

git diff
diff --git a/Rakefile b/Rakefile
index 2258128..63baf0c 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,6 +1,6 @@
require 'rake'
require 'rake/testtask'
-require 'rake/rdoctask'
+require 'rake/task'

WYSIHAT_ROOT = File.expand_path(File.dirname(FILE))
WYSIHAT_SRC_DIR = File.join(WYSIHAT_ROOT, 'src')

And no warning. And still .js was generated fine.