4.2.3
- The AppOpticsAPM::SDK.start_trace method now also reports metrics [AO-8290]
- New SDK methods: appoptics_ready? and tracing? [AO-8429]
- Improvement to log messages, they all start with [appoptics_apm/...] now [AO-6838]
- Update to README and rdoc comments [AO-6826]
- Refactor SDK versus API