v2.2.15 released

[Gedalya]

>> Also I have one minor issue to report.  dovecot broke API from 2.2.13 to 2.2.14 but it only provides version macros for the first two components of the version number.  This has caused a small upgrade problem for the antispam plugin which is in a separate package (dovecot-antispam.) Was that addressed in 2.2.15?
> I only remember an ABI problem with antispam. Recompiling fixed that AFAIK. (And no Dovecot version guarantees ABI compatibility.) Is there some API problem also?

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=765943