[v2] add Standard Resource metrics note to Changelog
- Provide KEDA go-client ([#494](https://github.com/kedacore/keda/issues/494))
- Define KEDA readiness and liveness probes ([#788](https://github.com/kedacore/keda/issues/788))
- KEDA Support for configurable scaling behavior in HPA v2beta2 ([#802](https://github.com/kedacore/keda/issues/802))
+- Adding Standard Resource metrics to KEDA ([#874](https://github.com/kedacore/keda/pull/874))
### Improvements
