misc: add VPE dependency

Author: jsm174

package.json

@@ -12,7 +12,8 @@
   "unity": "2021.2",
   "unityRelease": "7f1",
   "dependencies": {
-    "com.unity.visualscripting": "1.7.6"
+    "com.unity.visualscripting": "1.7.6",
+    "org.visualpinball.engine.unity": "0.0.1-preview.84"
   },
   "author": "freezy <freezy@vpdb.io>",
   "contributors": [