Add maintenance notice (#164)

fregante · web-flow · commit 2581e4b70dd5 · 2025-08-16T16:05:31.000+08:00
diff --git a/README.md b/README.md
@@ -1,3 +1,7 @@
+## UNMAINTAINED
+
+Refer to https://github.com/fregante/notifications-preview-github/issues/163
+
 # Notifications Preview for GitHub
 
 > Browser extension - Preview your notifications without leaving the page
