Tooling update

[tobia]

Hi. I just bought the book. I thought I'd mention a couple things as a PS newbie.

Chapter 2 mentions the :reset command, which does not seem to exist anymore. :reload seems to work best for me, because :clear throws away too much.

Also, you may want to mention the ugly warning the Bower guys decided to add to their package. It sure threw me off, until I investigated it further:

npm WARN deprecated bower@1.8.2: ...psst! Your project can stop working at any moment because its dependencies can change. Prevent this by migrating to Yarn: https://bower.io/blog/2017/how-to-migrate-away-from-bower/