Mention update to Unicode Version 13.0.0 and Emoji Version 13.1

Mention the update to Unicode Version 13.0.0 and Unicode Emoji
Version 13.1 in NEWS.md. This completes issue #17750. [ci skip]

1 files changed, 5 insertions, 0 deletions

diff --git a/NEWS.md b/NEWS.md
index 783f59ca2b..3a640a83dc 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -113,6 +113,11 @@ Outstanding ones only.
 
     * StructClass#keyword_init? is added [[Feature #18008]]
 
+* String
+
+    * Update Unicode version to 13.0.0 [[Feature #17750]]
+      and Emoji version to 13.0 [[Feature #18029]]
+
 * Queue
 
     * Queue#initialize now accepts an Enumerable of initial values.