should escape dot.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@5747 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rss/rexmlparser.rb

@@ -1,7 +1,7 @@
 require "rexml/document"
 require "rexml/streamlistener"
 
-/\A(\d+)\.(\d+)(?:.\d+)+\z/ =~ REXML::Version
+/\A(\d+)\.(\d+)(?:\.\d+)+\z/ =~ REXML::Version
 if ([$1.to_i, $2.to_i] <=> [2, 5]) < 0
 	raise LoadError, "needs REXML 2.5 or later (#{REXML::Version})"
 end