chore: make changelog consistent again

CHANGELOG.md

@@ -26,10 +26,10 @@ Types of changes:
   which `replyChannels` it supports. Must be a subset of the `replyChannels` of the services a Fachverfahren offers.
   The JWK contained in the `encryptionPublicKey` attribute will be used by the Fachverfahren to encrypt the Reply. (2131a8ba)
 
-## [1.1.0]
+## [1.1.0] - 2023-04-20
 
 ### Changed
 
 - `$schema` von einem Enum in eine RegEx geändert `(planning#267)`
 
-## [1.0.0]
+## [1.0.0] - 2022-03-16