* lib/csv.rb: fix minor typo by @baroquebobcat [fix GH-583][ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45510 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-04-03

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45511 b2dd03c8-39d4-4d8f-98ff-823fe69b080e