fix: address dev-dependency issues reported by npm audit

[hamirmahal]

Fixes #326

[hamirmahal]

Without this change

npm WARN deprecated circular-json@0.3.3: CircularJSON is in maintenance only, flatted is its successor.
npm WARN deprecated postinstall-build@5.0.3: postinstall-build's behavior is now built into npm! You should migrate off of postinstall-build and use the new `prepare` lifecycle script with npm 5.0.0 or greater.

added 472 packages, and audited 473 packages in 3s

93 packages are looking for funding
  run `npm fund` for details

1 high severity vulnerability

To address all issues, run:
  npm audit fix

[hamirmahal]

With this change

$  npm install

up to date, audited 473 packages in 713ms

93 packages are looking for funding
  run `npm fund` for details

found 0 vulnerabilities