Release v2.2.3

What's Changed

• Update README.md Logo by @austinpray-mixpanel in #182
• safer handling of nil superProperties by @jaredmixpanel in #183
• use ubuntu-latest in github release action by @jaredmixpanel in #184
• Make 'groups' argument optional in trackWithGroups by @m0rl in #169

New Contributors

• @austinpray-mixpanel made their first contribution in #182
• @m0rl made their first contribution in #169

Full Changelog: v2.2.1...v2.2.3