Update npm audit fix message to provide more instruction

[bradsk88]

Discussed this here:
https://npm.community/t/npm-audit-fix-does-not-provide-enough-information/377/4

Before

$ npm audit fix
npm WARN npm-test No description
npm WARN npm-test No repository field.
npm WARN npm-test No license field.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})

up to date in 1.537s
fixed 0 of 12 vulnerabilities in 396 scanned packages
  1 package update for 12 vulns involved breaking changes
  (use `npm audit fix --force` to install breaking changes; or do it by hand)

After

$ npm audit fix
npm WARN npm-test No description
npm WARN npm-test No repository field.
npm WARN npm-test No license field.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})

up to date in 1.547s
fixed 0 of 12 vulnerabilities in 396 scanned packages
  1 package update for 12 vulns involved breaking changes
  (use `npm audit fix --force` to install breaking changes; or refer to `npm audit` for steps to fix these manually)

[zkat]

This LGTM! Thanks for putting together the PR! 👍 🐑 🚀 💥