update README for info messages and new error types
update README for info messages and new error types

mchavarriagam/csvlint.rb,theodi/csvlint.rb,ResultadosDigitais/csvlint.rb,nickzoic/csvlint.rb,strategicdata/csvlint.rb,kickserv/csvlint.rb,strategicdata/csvlint.rb,jpmckinney/csvlint.rb