Update homevolt quality scale

Signed-off-by: Daniel Hjelseth Høyer <github@dahoiv.net>

homeassistant/components/homevolt/manifest.json

@@ -6,7 +6,7 @@
   "documentation": "https://www.home-assistant.io/integrations/homevolt",
   "integration_type": "device",
   "iot_class": "local_polling",
-  "quality_scale": "bronze",
+  "quality_scale": "silver",
   "requirements": ["homevolt==0.4.4"],
   "zeroconf": [
     {