This commit fixes the following warning. % ruby -riconv -ve "Iconv.conv('iso-8859-15', 'utf-8', 'hello')" ruby 2.5.0dev (2017-12-07 trunk 61059) [x86_64-darwin13] /Users/koic/.rbenv/versions/2.5.0-...

Fix `warning: constant ::Data is deprecated` from Ruby 2.5 by koic · Pull Request #12 · ruby/iconv