describe about Regexp.union.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@13660 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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diff --git a/NEWS b/NEWS
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+++ b/NEWS
@@ -31,6 +31,12 @@ with all sufficient information, see the ChangeLog file.
 
   * New method:
     Dir.mktmpdir
+
+=== New methods and features
+
+* builtin classes
+
+  * Regexp.union accepts an array of patterns.
           
 == Changes with Ruby 1.8.5