Add notable changes/fixes.

Author: ioquatix

en/news/_posts/2019-01-30-ruby-2-6-1-released.md

@@ -9,12 +9,13 @@ lang: en
 
 Ruby 2.6.1 has been released.
 
-This release includes some bug fixes.
-
+## Changes
 
-There are also some bug fixes.
+This release includes some bug fixes.
 See [commit logs](https://github.com/ruby/ruby/compare/v2_6_0...v2_6_1) for more details.
 
+* [Net::Protocol::BufferedIO#write raises NoMethodError when sending large multi-byte string](https://bugs.ruby-lang.org/issues/15468)
+
 ## Download
 
 * <https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.1.tar.gz>