https://forums.bitfire.at/topic/1015/davdroid-1-0-has-been-released/11
Theres now an option to disable
RFC6868-encoded VCards because of problems with Posteo. If youre
using Posteo CardDAV, go to Account Settings and disable RFC6868
VCards.
* option to disable RFC6868-encoded
VCards
* CalDAV: improved alarm handling
(supporting more types)
* minor improvements