forgot multiple flag on two attributes

objects/stairwell/definition.json

@@ -9,6 +9,7 @@
     "environment": {
       "description": "Stairwell environments that this object has been seen within",
       "misp-attribute": "comment",
+      "multiple": true,
       "ui-priority": 0
     },
     "imphash": {
@@ -71,6 +72,7 @@
     "yara-rule-match": {
       "description": "Stairwell yara rule resource names which have matched on this object",
       "misp-attribute": "comment",
+      "multiple": true
       "ui-priority": 0
     }
   },
@@ -84,4 +86,4 @@
   ],
   "uuid": "113d31ab-6eea-46df-976c-e955c369acd2",
   "version": 1
-}
+}