TBR Bump extension version

I pushed an extension because of the endpoint v6 changes.
(Also updated chat. Namespace browser and tutorials are fine)

Change-Id: Ia6bc522501dc1894103f6397a9dafca0c3d42ed7
diff --git a/extension/manifest.json b/extension/manifest.json
index a6d7465..581301e 100644
--- a/extension/manifest.json
+++ b/extension/manifest.json
@@ -1,6 +1,6 @@
 {
   "name": "Vanadium Extension",
-  "version": "0.1.19",
+  "version": "0.1.20",
   "description": "Access and create Vanadium services from JavaScript.",
   "manifest_version": 2,
   "icons": {