Add hvac_state property to nest sensors (home-assistant#1559)

joerocklin · fabaff · commit 60b57ae58b89 · 2016-12-18T09:57:40.000+01:00
diff --git a/source/_components/sensor.nest.markdown b/source/_components/sensor.nest.markdown
@@ -43,6 +43,7 @@ The following conditions are available by device:
   - operation\_mode
   - temperature
   - target
+  - hvac\_state: The currently active state of the HVAC system, `heating`, `cooling`, or `off`.
 - Nest Protect:
   - co\_status
   - smoke\_status 
