Allow as Custom Repo [shbatm/hacs-isy994] (#1699)

* Allow shbatm/hacs-isy994

* Update blacklist

---------

Co-authored-by: Joakim Sørensen <ludeeus@ludeeus.dev>

removed

@@ -568,12 +568,6 @@
     "removal_type": "remove",
     "link": "https://github.com/hacs/integration/issues/2121"
   },
-  {
-    "repository": "shbatm/hacs-isy994",
-    "reason": "Repository was used as a beta test for core ISY994 and is no longer required.",
-    "removal_type": "remove",
-    "link": "https://github.com/shbatm/hacs-isy994"
-  },
   {
     "repository": "brefra/home-assistant-plugwise-stick",
     "reason": "Replaced by alternative custom integration",
@@ -1072,4 +1066,4 @@
     "removal_type": "remove",
     "link": "https://www.home-assistant.io/integrations/nobo_hub/"
   }
-]
+]