Fix hassfest warning

Author: pnbruckner

custom_components/google_maps/__init__.py

@@ -9,7 +9,11 @@
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import CONF_USERNAME, EVENT_HOMEASSISTANT_STOP, Platform
 from homeassistant.core import Event, HomeAssistant
-from homeassistant.helpers import device_registry as dr, entity_registry as er
+from homeassistant.helpers import (
+    config_validation as cv,
+    device_registry as dr,
+    entity_registry as er,
+)
 from homeassistant.helpers.typing import ConfigType
 
 from .const import CONF_COOKIES_FILE, CONF_CREATE_ACCT_ENTITY, DOMAIN, NAME_PREFIX
@@ -19,6 +23,8 @@
 _LOGGER = logging.getLogger(__name__)
 _PLATFORMS = [Platform.BINARY_SENSOR, Platform.DEVICE_TRACKER]
 
+CONFIG_SCHEMA = cv.platform_only_config_schema(DOMAIN)
+
 
 async def async_setup(hass: HomeAssistant, _: ConfigType) -> bool:
     """Set up integration."""