Add missing link to meta topic in README (#15)

Add missing link to meta topic in README (#15)

diff --git a/README.md b/README.md
index ecccb83..2a32d86 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,8 @@
 * Version: 1.2
 * License: MIT License
 
+https://meta.discourse.org/t/discourse-sitemap/40348/
+
 ## Installation
 
 Follow [the usual installation instructions](https://meta.discourse.org/t/install-plugins-in-discourse/19157).

GitHub sha: d477acd7

This commit appears in #15 which was approved by CvX. It was merged by CvX.