Tweak list

- [ ] Add callouts that nsp is no more
- [ ] Switch to babel-preset-env "Babel-preset-env has replaced babel-preset-latest.
- [ ] New versions of webpack now support an environment setting. See the update pull request here for details: xxx
- [ ] Update the list of JS versions to say what came in 2017 and 2018 (in transpiling module)
- [ ] Clarify via callout in Transpiling module "Demo: Set up Babel" that babel-node actually calls the babel-cli package.
- [ ] Add callout on npm install page: "Be sure to use the exact versions I specify to assure you can follow along with the course. When you're done, I'm maintaining a GitHub repo here that shows how to tweak the final course exercise to use the latest versions of all packages."

Review update PR for other opportunities.

Start by reviewing the update pull request and the Transpiling module, especially the “Demo: Set up Babel” section, the npm install page, and the list of JS versions. Update the requested callouts, package guidance, version history, and Babel CLI clarification, then check that every checklist item is addressed and the course instructions remain consistent.

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