docs: release notes for 3.0.18

docsrc/imap/download/release-notes/3.0/x/3.0.18.rst

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+===============================
+Cyrus IMAP 3.0.18 Release Notes
+===============================
+
+.. IMPORTANT::
+
+    This is a bug-fix release in the 3.0 series.
+
+    Refer to the Cyrus IMAP 3.0.0 Release Notes for important information
+    about the 3.0 series, including upgrading instructions.
+
+Download via HTTPS:
+
+    *   https://github.com/cyrusimap/cyrus-imapd/releases/download/cyrus-imapd-3.0.18/cyrus-imapd-3.0.18.tar.gz
+    *   https://github.com/cyrusimap/cyrus-imapd/releases/download/cyrus-imapd-3.0.18/cyrus-imapd-3.0.18.tar.gz.sig
+
+
+.. _relnotes-3.0.18-changes:
+
+Changes Since 3.0.17
+====================
+
+Build changes
+-------------
+
+* Fixed: iCal GEO property is text in new libical versions
+* Fixed: docs now build correctly with python3 and Sphinx 3.4
+
+Bug fixes
+---------
+
+* Fixed :issue:`4002`: cyradm: allow LIST command even when support_referrals
+  is false
+* Fixed :issue:`4216`: httpd killed by SIGSEGV for calendar request (thanks
+  Дилян Палаузов)
+
+Other changes
+-------------
+
+* Fixed :issue:`4380`: ``backend_version()`` now properly parses the remote
+  server's version string, and can recognise when it is newer than the local
+  server.  This means XFER to a newer backend no longer requires a local
+  software update to recognise the new version number first.