Go Version 1.20 Update and minor changes

What's Changed

• Add support for custom CA by @jsnjack in #41
• fix panic when transportOptions is nil by @justhyped in #47
• replace ioutil with io by @justhyped in #46
• Improvements by @justhyped in #48

New Contributors

• @jsnjack made their first contribution in #41
• @justhyped made their first contribution in #47

Full Changelog: v1.3.11...v1.3.12