fix json validate (#112)

pvizeli · web-flow · commit 863456525f4c · 2017-07-25T00:01:02.000+02:00
diff --git a/hassio/api/addons.py b/hassio/api/addons.py
@@ -55,7 +55,7 @@ def _pretty_devices(addon):
         dev_list = addon.devices
         if not dev_list:
             return
-        return set(row.split(':')[0] for row in dev_list)
+        return [row.split(':')[0] for row in dev_list]
 
     @api_process
     async def list(self, request):
