added vult donation link (with his permission)

plugins/VultModules.json

@@ -4,6 +4,7 @@
   "author": "modlfo",
   "homepage": "https://modlfo.github.io/VultModules",
   "manual": "https://modlfo.github.io/VultModules",
+  "donation": "https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=RRMY2QPYEZT2S",
   "source": "https://github.com/modlfo/VultModules",
   "downloads": {
     "win": {