Update climate.generic_thermostat.markdown (home-assistant#941)

Danielhiversen · fabaff · commit 112280e45350 · 2016-09-16T12:10:05.000+02:00
diff --git a/source/_components/climate.generic_thermostat.markdown b/source/_components/climate.generic_thermostat.markdown
@@ -40,6 +40,6 @@ Configuration variables:
 - **target_sensor** (*Required*): `entity_id` for a temperature sensor, target_sensor.state must be temperature.
 - **min_temp** (*Optional*): Set minimum set point available (default: 7)
 - **max_temp** (*Optional*): Set maximum set point available (default: 35)
-- **target_temp** (*Required*): Set intital target temperature. Failure to set this variable will result in target temperature being set to null on startup.
+- **target_temp** (*Optional*): Set intital target temperature. Failure to set this variable will result in target temperature being set to null on startup.
 - **ac_mode** (*Optional*): Set the switch specified in the *heater* option to be treated as a cooling device instead of a heating device.
 - **min_cycle_duration** (*Optional*): Set a minimum amount of time that the switch specified in the *heater* option must be in it's current state prior to being switched either off or on.
