Run travis on 2.4 ONLY Breaking changes between CSV library and Ruby 2.3 and 2.4
Run travis on 2.4 ONLY
Breaking changes between CSV library and Ruby 2.3 and 2.4

nickzoic/csvlint.rb,strategicdata/csvlint.rb,strategicdata/csvlint.rb,ResultadosDigitais/csvlint.rb,theodi/csvlint.rb