Update package.json

Author: gnykka

package.json

@@ -21,6 +21,7 @@
     "fabric": "^4.6.0",
     "fpsmeter": "0.3.1",
     "konva": "8.1.4",
+    "leafer-ui": "^1.0.0-rc.9",
     "p5": "^1.4.0",
     "paper": "^0.12.15",
     "parcel-bundler": "1.12.5",