Update version to v3.

plugin.json

@@ -1,7 +1,7 @@
 {
   "slug": "Fundamental",
   "name": "VCV Free",
-  "version": "2.6.4",
+  "version": "3.6.4",
   "license": "GPL-3.0-or-later",
   "brand": "VCV",
   "author": "VCV",
@@ -11,7 +11,7 @@
   "manualUrl": "https://vcvrack.com/Free#manual",
   "sourceUrl": "https://github.com/VCVRack/Fundamental",
   "changelogUrl": "https://vcvrack.com/Free#changelog",
-  "minRackVersion": "2.4.0",
+  "minRackVersion": "",
   "modules": [
     {
       "slug": "VCO",