Update manifest.json

Update version and remove activetab permission

Author: maxmousee

chrome/manifest.json

@@ -3,7 +3,7 @@
   "name": "Simple PONG",
   "short_name": "PONG",
   "description": "Simple and lightweight PONG Game written in JavaScript using jQuery",
-  "version": "2.1",
+  "version": "3.0",
   "icons": { "16": "icon.png",
              "32": "icon.png",
              "48": "icon.png",
@@ -12,7 +12,5 @@
     "default_icon": "icon.png",
     "default_popup": "game.html"
   },
-  "permissions": [
-    "activeTab"
-  ]
+  "permissions": []
 }