v1.6.10

Changes

• Update README to include disclaimer about time (address #27)
• fix: Add AWS IoT example (thanks to @gannaramu)
• fix: Add support for Teensy >= 3.0 (thanks to @gannaramu)
• ci: Switch to GitHub Actions for CI (#28)
• docs(readme): update board support
• fix: add function to manually update the x509 verification time