Badge request: dependents of a npm package

Would be nice to have a badge to show off how many npm packages depend on my package. For example, the `1717 Dependents` number at https://www.npmjs.com/package/got.

You could either:
- Use the API. Example: https://github.com/chrisdickinson/npm-get-dependents
- Scrape. Example: https://github.com/astur/check-npm-dependents

The issue does not name implementation files or tests. Start by reviewing how existing Shields badges fetch npm metadata, then inspect the linked npm-get-dependents API and scraping example. Done means a badge can display the number of npm packages depending on a requested package.

Written by the indexing model from the issue text.