Update extension's manifest to v3

Author: payne911

plugin/manifest.json

@@ -1,16 +1,19 @@
 {
+  "manifest_version": 3,
   "name": "Useful Forks",
   "version": "2.2",
+
   "description": "To list GitHub forks ordered by stars, with additional information and automatic filtering of irrelevant ones.",
-  "permissions": [
-    "*://github.com/*"
-  ],
   "icons": {
     "16": "images/useful-forks-16.png",
     "32": "images/useful-forks-32.png",
     "48": "images/useful-forks-48.png",
     "128": "images/useful-forks-128.png"
   },
+
+  "host_permissions": [
+    "*://github.com/*"
+  ],
   "content_scripts": [
     {
       "matches": [
@@ -22,6 +25,5 @@
       "run_at": "document_idle",
       "all_frames": true
     }
-  ],
-  "manifest_version": 2
+  ]
 }