perf(travis): Update node 6.2 to 6.3 in travis config
perf(travis): Update node 6.2 to 6.3 in travis config

rcaracaus/pa11y-api,sebasalvarado/dementia-hacks-api,kenzanboo/mail,KunalKapadia/express-mongoose-es6-rest-api,ssmlee04/docker-user-module,KunalKapadia/express-mongoose-es6-rest-api,ssmlee04/docker-user-module,maratgaip/MusicApi,wen911119/my-node-api