doc: update changelog

Author: jengelh

doc/changelog.rst

@@ -1,3 +1,30 @@
+1.20.28
+=======
+
+Fixes:
+
+* lib: repair wrong propid for PR_IPM_PUBLIC_FOLDERS_ENTRYID
+* exmdb_provider: avoid use-after-free crash related to PF read
+  state username handling
+* oxcmail: have smime_clearsigned test for the right protocol strings
+* email_lib: make ICAL_TIME::twcompare behave symmetrically
+* oxcical: timezone switches were erroneously emitted with
+  dayofmonth 32..35 in certain years
+* exmdb_provider: output HTML according to PR_INTERNET_CPID/RPC character set
+
+Enhancements:
+
+* doc: mention issues related to senders/recipients with ZARAFA address type
+* autodiscover: test URLs from Autodiscover response for validity
+* exmdb_provider: add "exmdb_pf_read_states" config directive
+* exmdb_provider: add "exmdb_pf_read_per_user" config directive
+* imap: add directive "imap_cmd_debug"
+
+Changes:
+
+* zcore: return ecNotFound from mapi_getstoreentryid when unable to resolve user
+
+
 1.20 (2022-04-30)
 =================