ruby/www.ruby-lang.org — pull request #510 by makimoto (2013-12-26 02:10:48+00:00)
Title: Fix 2.1.0 release entries (s/Decimal/Rational/g)

One of new literals in 2.1.0 is not "Decimal" but "Rational".

https://github.com/ruby/ruby/blob/v2_1_0/NEWS#L19