Update sensor.rflink.markdown (home-assistant#2050)

leeuwte · fabaff · commit db08498ef75f · 2017-02-16T10:17:10.000+01:00
According to the source code  of the rflink sensor component the value 'sensor_type' is required.
diff --git a/source/_components/sensor.rflink.markdown b/source/_components/sensor.rflink.markdown
@@ -53,7 +53,7 @@ Configuration variables:
 Device configuration variables:
 
 - **name** (*Optional*): Name for the device, defaults to Rflink ID.
-- **sensor_type_** (*Optional*): Override automatically detected type of sensor.
+- **sensor_type** (*Required*): Override automatically detected type of sensor.
 - **unit_of_measurement** (*Optional*): Override automatically detected unit of sensor.
 - **aliasses** (*Optional*): Alternative Rflink ID's this device is known by.
 
