Add docs about Schleuder version 3.5.2

_posts/2020-06-09-schleuder-3-5-2-released.md

+---
+layout: post
+title:  "Schleuder 3.5.2 released"
+date: "2020-06-09"
+---
+
+This release ships a bug fix:
+
+* `x-add-key` is able to handle inline key material, followed by non-key material, like a signature included in the body.
+
+Please see the [user-relevant changes]({{ "schleuder/docs/changes.html" | absolute_url }}) and the [changelog](https://0xacab.org/schleuder/schleuder/blob/master/CHANGELOG.md#352-2020-06-09) for details.

schleuder/docs/changes.md

@@ -24,3 +24,4 @@ User-relevant changes in version 3.5 compared to version 3.4:
 * Incoming mails encrypted to an absent key, using symmetric encryption or containing PGP-garbage are handled in a more graceful manner: No exception is thrown, admins aren't notified (and annoyed), instead the sender is informed how to do better.
 * Notification mails sent to admins contain a List-Id header. This should help with filtering such messages, which wasn't easy to do in a reliable way.
 * `x-add-key` is able to handle mails with attached, quoted-printable encoded keys. Such mails might be produced by Thunderbird.
+* `x-add-key` is able to handle inline key material, followed by non-key material, like a signature included in the body.