Update changes.md

docs/reference/changes.md

 # Change log
 
-## 1.3.8 (unreleased)
+## 1.3.8
 
 - Changes to support better migration and validation of config between versions
   of type implementations.
@@ -11,7 +11,7 @@
 - Inlay tidies up better if you uninstall it. (Warning, if not obvious: it will 
   now delete all inlay-managed assets, as well as bundle scripts and inlay-specific database tables)
 
-## 1.3.6 (unreleased)
+## 1.3.6 (was never released)
 
 - Fix a PHP 8.1 warning in certain situations
 - Adds concept of inlay instances being ON/OFF. Also "Broken". If an inlay is