add 14.15.3 and 15.5.0 for node inventory
add 14.15.3 and 15.5.0 for node inventory

Scalingo/nodejs-buildpack,Scalingo/nodejs-buildpack,Scalingo/nodejs-buildpack,heroku/heroku-buildpack-nodejs,heroku/heroku-buildpack-nodejs,Scalingo/nodejs-buildpack,Scalingo/nodejs-buildpack,heroku/heroku-buildpack-nodejs,heroku/heroku-buildpack-nodejs,heroku/heroku-buildpack-nodejs