Add issue ref to changelog

Author: marteinn

CHANGELOG.md

@@ -6,8 +6,8 @@
 - Raise console warning if admin page field is missing
 
 ### Fixed
-- Make sure html chracters are decoded in BaseSettings.get_title()/get_description()
-- Make sure drafttail field content are read as plaintext
+- Make sure html chracters are decoded in BaseSettings.get_title()/get_description() #17
+- Make sure drafttail field content are read as plaintext #18
 
 ### Removed