docs: fix package description grammar in package.json

Author: hackerzhuli

package.json

@@ -3,7 +3,7 @@
   "displayName": "Unity Code Pro",
   "author": "hackerzhuli",
   "icon": "assets/icon.png",
-  "description": "Unity IDE right inside of VS Code!",
+  "description": "Unity IDE right inside VS Code!",
   "version": "1.1.0",
   "publisher": "hackerzhuli",
   "license": "MIT",