Add the deprecation of flip-flops to NEWS page [ci skip]

[Fix GH-2047]

From: Junichi Ito <jit@sonicgarden.jp>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66317 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index 31e585e9fc..48327ede39 100644
--- a/NEWS
+++ b/NEWS
@@ -46,6 +46,8 @@ sufficient information, see the ChangeLog file or Redmine
 * Print +cause+ of the exception if the exception is not caught and printed
   its backtraces and error message [Feature #8257]
 
+* Flip-flop syntax is deprecated. [Feature #5400]
+
 === Core classes updates (outstanding ones only)
 
 [Array]