upgrade nokogiri dependency to support traveling-ruby nokogiri 1.6.5
upgrade nokogiri dependency to support traveling-ruby nokogiri 1.6.5

tas50/foodcritic,offslinker/foodcritic,pkang/foodcritic,acrmp/foodcritic,nathenharvey/foodcritic,Foodcritic/foodcritic,odcinek/foodcritic,coderanger/foodcritic,askl56/foodcritic,clintoncwolfe/foodcritic,chazzly/foodcritic,akihiro17/foodcritic