https://tinyurl.com/353hchay

4.3.1.1 → 4.3.8:

* automatic sync over WorkManager (replaces AndroidSyncFramework)

* new VPN setting to better control "Internet" connectivity

* fix problem that caused battery drain

* fixed rare migration bug

* [CalDAV] better ignoring of local empty or blank values

* [CardDAV] improved group support with KIND values

* Certificate handling improved

* Timezone improvments

* and many more smaller fixes and improvements!