* Add boot time to System Bridge * Update homeassistant/components/system_bridge/sensor.py Co-authored-by: Paulus Schoutsen <paulus@home-assistant.io> * Add missing import * Update homeassistant/components/system_bridge/sensor.py Co-authored-by: Paulus Schoutsen <paulus@home-assistant.io> Co-authored-by: Paulus Schoutsen <paulus@home-assistant.io> Co-authored-by: Franck Nijhof <frenck@frenck.nl>