Tweak list

[coryhouse]

• 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.