Add NEWS about [Feature #8661]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58785 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

NEWS

@@ -111,6 +111,9 @@ with all sufficient information, see the ChangeLog file or Redmine
 
 === Miscellaneous changes
 
+* Print backtrace and error message in reverse order if STDERR is unchanged and a tty.
+  [Feature #8661] [experimental]
+
 * configure option --with-ext now mandates its arguments.  So for
   instance if you run ./configure --with-ext=openssl,+ then the
   openssl library is guaranteed compiled, otherwise the build fails