chore(release): sync manifest version 0.3.1 and update updates.json

manifest.json

@@ -1,7 +1,7 @@
 {
   "manifest_version": 2,
   "name": "Archive.org Link Grabber",
-  "version": "0.3.0",
+  "version": "0.3.1",
   "description": "Filter and export archive.org /download links; copy or send to aria2 RPC.",
   "applications": {
     "gecko": {

releases/updates.json

@@ -28,6 +28,15 @@
               "strict_min_version": "91.0"
             }
           }
+        },
+        {
+          "version": "0.3.1",
+          "update_link": "https://add-ons.jordanwages.com/archive-org-link-grabber/abf5f9638af544919be4-0.3.1.xpi",
+          "applications": {
+            "gecko": {
+              "strict_min_version": "91.0"
+            }
+          }
         }
       ]
     }