Update manifest.json

Author: ping-localhost

custom_components/panda_status/manifest.json

@@ -10,5 +10,6 @@
     ],
     "config_flow": true,
     "documentation": "https://github.com/ping-localhost/panda_status",
-    "issue_tracker": "https://github.com/ping-localhost/panda_status/issues"
-}
+    "issue_tracker": "https://github.com/ping-localhost/panda_status/issues",
+    "iot_class": "local_polling"
+}