docs: release notes for 3.6.1

docsrc/imap/download/release-notes/3.6/x/3.6.1.rst

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+
+==============================
+Cyrus IMAP 3.6.1 Release Notes
+==============================
+
+Download from GitHub:
+
+    *   https://github.com/cyrusimap/cyrus-imapd/releases/download/cyrus-imapd-3.6.1/cyrus-imapd-3.6.1.tar.gz
+    *   https://github.com/cyrusimap/cyrus-imapd/releases/download/cyrus-imapd-3.6.1/cyrus-imapd-3.6.1.tar.gz.sig
+
+.. _relnotes-3.6.1-changes:
+
+Changes since 3.6.0
+===================
+
+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.