need to update bundler on travis so we can test ruby 2.2
need to update bundler on travis so we can test ruby 2.2

chingor13/json_api_client,flex-commerce/json_api_client,dplummer/json_api_client,datapipe/json_api_client,jondruse/json_api_client,bayarja/json_api_client,shiftcommerce/json_api_client,Hoodline/json_api_client,SouthernMade/json_api_client