[KEYCLOAK-12820] Update Travis to test the most recent Node.js releases
[KEYCLOAK-12820] Update Travis to test the most recent Node.js releases

keycloak/keycloak-nodejs-connect,abstractj/keycloak-nodejs-connect,keycloak/keycloak-nodejs-connect,keycloak/keycloak-nodejs-connect,abstractj/keycloak-nodejs-connect,abstractj/keycloak-nodejs-connect