release 1.3

[Dan Callaghan]

I've just released Sup 1.3. It includes some fixes for long-standing
bugs, as well as a change in preparation for the coming frozen string
literals in Ruby 3.5.

The new release is available from Rubygems and Github.

== 1.3 / 2025-04-21

* #596: If a message lacks a Date header, or the Date header is not in valid
RFC2822 format, the local delivery timestamp of the message will now be used
instead. Fixes a bug where such messages would constantly jump to the top of
the thread list.
* #502: Fixed incorrect Content-Transfer-Encoding headers when sending GPG
signed or encrypted messages with attachments.
* #522: Sup now uses the configured signing key when sending a message that is
both signed and encrypted. Previously it would ignore the configured key and
use the GPG default signing key.
* #489: Attachments are now encoded if they have lines longer than 998
characters.
* #602: The message/global MIME type is now recognised as an embedded message.
* Sup is now tested on Ruby 3.4.

--
Dan Callaghan <d...@djc.id.au>