Clarify that this file is not actively maintained.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@3100 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2002-12-01 09:08:14 +00:00 · 2002-12-01 09:08:14 +00:00 · 59d4702438
--- a/doc/NEWS
+++ b/doc/NEWS
@ -1,3 +1,5 @@
 This file is not actively maintained.  See ChangeLog for recent changes.
 : Set class (set.rb)
  Imported.