downloader.rb: use File.read instead of IO.read
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67591 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
downloader.rb: use File.read instead of IO.read
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67591 b2dd03c8-39d4-4d8f-98ff-823fe69b080e