Fix typo in README
Fix typo in README

For the csv example, it references a non-existent object in the instantiation of the `CSV` object
wrightak/SwiftCSV,victor-fdez/SwiftCSV,naoty/SwiftCSV,victor-fdez/SwiftCSV,ssidelnikov/SwiftCSV,naoty/SwiftCSV,planetexpress69/SwiftCSV,wrightak/SwiftCSV,reidmweber/SwiftCSV,reidmweber/SwiftCSV,thecb4/SwifterCSV,planetexpress69/SwiftCSV,thecb4/SwifterCSV,ssidelnikov/SwiftCSV