misc: bump VPE dependency and fix license url

Author: jsm174

VisualPinball.Engine.PinMAME.Unity/package.json

@@ -7,18 +7,18 @@
     "Unity",
     "PinMAME"
   ],
-  "unity": "2020.3",
-  "unityRelease": "15f2",
+  "unity": "2021.2",
+  "unityRelease": "7f1",
   "dependencies": {
-    "org.visualpinball.engine.unity": "0.0.1-preview.56"
+    "org.visualpinball.engine.unity": "0.0.1-preview.84"
   },
   "author": "freezy <[email protected]>",
   "contributors": [
     "jsm174 <[email protected]>"
   ],
   "documentationUrl": "https://docs.visualpinball.org/plugins/pinmame/",
   "changelogUrl": "https://docs.visualpinball.org/CHANGELOG.html",
-  "licensesUrl": "https://github.com/VisualPinball/VisualPinball.Unity.Hdrp/blob/master/LICENSE",
+  "licensesUrl": "https://github.com/VisualPinball/VisualPinball.Engine.PinMAME/blob/master/LICENSE",
   "repository": {
     "url": "https://github.com/VisualPinball/VisualPinball.Engine.PinMAME.git",
     "type": "git"