Update extension list

Author: GitHub Actions Bot

extensions.json

@@ -342,6 +342,17 @@
             "method": "git",
             "directory": "."
         },
+        {
+            "name": "Readeck Button",
+            "author": "Joedmin",
+            "description": "Add articles to Readeck with one simple button click or a keyboard shortcut.",
+            "version": "0.3",
+            "entrypoint": "ReadeckButton",
+            "type": "user",
+            "url": "https://github.com/Joedmin/xExtension-readeck-button",
+            "method": "git",
+            "directory": "."
+        },
         {
             "name": "Reading Time",
             "author": "Lapineige",