Update package.json

Author: hasparus

packages/custom-properties/package.json

@@ -20,6 +20,6 @@
   },
   "devDependencies": {
     "@theme-ui/css": "^0.3.1",
-    "@types/pluralize": "0.0.29"
+    "@types/pluralize": "^0.0.29"
   }
 }