Added sensor device_class 'light' (#1143)

* Added sensor device_class 'light'

* Changed icon

* Changed device_class name

src/util/hass-attributes-util.html

@@ -31,6 +31,7 @@ window.hassAttributeUtil.DOMAIN_DEVICE_CLASS = {
   sensor: [
     'battery',
     'humidity',
+    'illuminance',
     'temperature'
   ],
 };

src/util/hass-util.html

@@ -298,6 +298,8 @@ window.hassUtil.sensorIcon = (state) => {
     }
     case 'humidity':
       return 'mdi:water-percent';
+    case 'illuminance':
+      return 'mdi:brightness-5';
     case 'temperature':
       return 'mdi:thermometer';
     default: