TBR: Bump ext'n version.

Change-Id: I590f6dd8cbdc2ee55a0238538fac126c5dc19549
diff --git a/extension/manifest.json b/extension/manifest.json
index e5bf9c4..ff4779b 100644
--- a/extension/manifest.json
+++ b/extension/manifest.json
@@ -1,6 +1,6 @@
 {
   "name": "Vanadium Extension",
-  "version": "0.1.17",
+  "version": "0.1.18",
   "description": "Access and create Vanadium services from JavaScript.",
   "manifest_version": 2,
   "icons": {