Add integration_type hub to econet (home-assistant#158940)

Author: joostlek

homeassistant/components/econet/manifest.json

@@ -4,6 +4,7 @@
   "codeowners": ["@w1ll1am23"],
   "config_flow": true,
   "documentation": "https://www.home-assistant.io/integrations/econet",
+  "integration_type": "hub",
   "iot_class": "cloud_push",
   "loggers": ["paho_mqtt", "pyeconet"],
   "requirements": ["pyeconet==0.1.28"]