Remove 2.6 testing for now
Remove 2.6 testing for now

There are changes that need to be made to make it pass, so we can do that on a separate branch. 2.5 is good though.
nickzoic/csvlint.rb,theodi/csvlint.rb,ResultadosDigitais/csvlint.rb,strategicdata/csvlint.rb,strategicdata/csvlint.rb