Add NEWS about coroutine implementation.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66339 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2018-12-11 23:49:29 +00:00 · 2018-12-11 23:49:29 +00:00 · 61c2022595
--- a/3
+++ b/3
@ -48,6 +48,9 @@ sufficient information, see the ChangeLog file or Redmine

 * Flip-flop syntax is deprecated. [Feature #5400]

+* Native implementation of coroutines to improve performance of Fiber.
+  [Feature #14739]
+
 === Core classes updates (outstanding ones only)

 [Array]