Update changelog

CHANGELOG.rst

@@ -22,6 +22,7 @@ Added
 * Global calendar system
 * Calendar for birthdays of persons
 * Holiday model to track information about holidays.
+* Frontend for managing holidays.
 * [Dev] Components for implementing standard CRUD operations in new frontend.
 * [Dev] Options for filtering and sorting of GraphQL queries at the server.
 * [Dev] Managed models for instances handled by other apps.
@@ -32,6 +33,7 @@ Changed
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 * Management of school terms was migrated to new frontend.
+* [Dev] Child groups are exposed in the GraphQL type for groups.
 
 Fixed
 ~~~~~
@@ -49,8 +51,6 @@ Changed
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 * uWSGI is now installed together with AlekSIS-Core per default.
-* Introduce Holiday model to track information about holidays.
-* Created field for child groups in the GraphQL type for groups.
 
 Fixed
 ~~~~~
@@ -63,8 +63,8 @@ Fixed
 * [Docker] Clear obsolete bundle parts when adding apps using ONBUILD
 * Extensible forms that used a subset of fields did not render properly
 
-`3.1.1` - 2023-07-01
---------------------
+`3.1.1`_ - 2023-07-01
+---------------------
 
 Fixed
 ~~~~~