Migrate from node-request to up-to-date postman-request fork

What's Changed

• correction of README.md by @vit100 in #147
• test: fix test failures by @markstos in #151
• address dep vulns by @markstos in #153
• Secure, compatible replacement of request with supported postman-request fork by @markstos in #152

New Contributors

• @vit100 made their first contribution in #147

Full Changelog: v7.1.0...v8.0.0