Remove Marketplace preview flag (#987)

Author: testforstephen

package.json

@@ -5,7 +5,7 @@
   "version": "0.41.0",
   "icon": "resources/logo.png",
   "publisher": "vscjava",
-  "preview": true,
+  "preview": false,
   "aiKey": "7c4292ac-8ca8-4e02-9f1c-0b73e1eeeca4",
   "engines": {
     "vscode": "^1.75.0"