major: use please-upgrade-node

[brody4hire]

https://www.npmjs.com/package/please-upgrade-node

to enforce the Node.js engine requirement more strongly (in lib/jasmine-node/index.js)

should be done together with adding engines field as I had proposed in PR #443

should be part of new major release discussed in #436

Thanks to Prettier project where I first saw this in use.