add changelog entries

CHANGELOG.md

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+# Changelog for chatmail deployment 
+
+## unreleased
+
+### Changes since March 15th, 2024
+
+- Fix various tests to pass again with "cmdeploy test". 
+  ([#245](https://github.com/deltachat/chatmail/pull/245),
+  [#242](https://github.com/deltachat/chatmail/pull/242)
+
+- Ensure lets-encrypt certificates are reloaded after renewal 
+  ([#244]) https://github.com/deltachat/chatmail/pull/244
+
+- Persist tokens to avoid iOS users loosing push-notifications when the
+  chatmail metadata service is restarted (happens regularly during deploys)
+  ([#238](https://github.com/deltachat/chatmail/pull/239)
+
+- Fix failing sieve-script compile errors on incoming messages
+  ([#237](https://github.com/deltachat/chatmail/pull/239)
+
+- Fix quota reporting after expunging of old mails
+  ([#233](https://github.com/deltachat/chatmail/pull/239)