[RCU] Roundcube webmail 1.6 release candidate released

[Aleksander Machniak]

This is the release candidate for the next major version 1.6 of 
Roundcube webmail.

It includes a small number of improvements and fixes in comparison to 
the beta release. For more information read the changelogs.

https://github.com/roundcube/roundcubemail/releases/tag/1.6-rc
https://github.com/roundcube/roundcubemail/releases/tag/1.6-beta

We believe it is production ready, but we recommend to test it on a 
separate environment. And don't forget to backup your data before 
installing it.

ps. This is the first time I created a Roundcube release, I hope that 
all works as it should.

Cheers,
Alec