message: Add an npm badge for latest tag
  That way we have at least some link to the npm package listing.
diff: @@ -11,6 +11,7 @@ TypeScript type definitions for [Foundry Virtual Tabletop](https://foundryvtt.co
  ![GitHub closed 0.7.x issues by-label](https://img.shields.io/github/issues-closed-raw/League-of-Foundry-Developers/foundry-vtt-types/foundry%200.7.x?color=%23fe631d)
  ![GitHub 0.8.x issues by-label](https://img.shields.io/github/issues-raw/League-of-Foundry-Developers/foundry-vtt-types/foundry%200.8.x?color=%23fe631d)
  ![GitHub closed 0.8.x issues by-label](https://img.shields.io/github/issues-closed-raw/League-of-Foundry-Developers/foundry-vtt-types/foundry%200.8.x?color=%23fe631d)
  +![npm (tag)](https://img.shields.io/npm/v/@league-of-foundry-developers/foundry-vtt-types/latest)
  </div>
  