update travis to use node as the language
update travis to use node as the language

mefellows/pact-consumer-js-dsl,bochaco/pact-consumer-js-dsl,mefellows/pact-consumer-js-dsl,DiUS/pact-consumer-js-dsl,bochaco/pact-consumer-js-dsl,bochaco/pact-consumer-js-dsl,DiUS/pact-consumer-js-dsl,DiUS/pact-consumer-js-dsl,mefellows/pact-consumer-js-dsl