Release v4.0.1

What's Changed

• Update README to use v4 instead of v3 by @austin-denoble in #113
• Add PrivateHost to Index by @austin-denoble in #115
• Fix ensureHostHasHttps by @eyang-2 in #114

New Contributors

• @eyang-2 made their first contribution in #114

Full Changelog: v4.0.0...v4.0.1