update changelog

Author: Clickism

CHANGELOG.md

@@ -1,3 +1,4 @@
 - Added new **?customdata** tag
   - This tag targets mobs that have custom data in their persistent data containers.
-  - You can use this tag to target mobs added by external plugins.
+  - You can use this tag to target mobs added by external plugins.
+  - For more information: https://clickism.de/docs/clickmobs/tags