Hello,
sprinklers_pi is written by Richard Zimmerman and is a 3rd party firmware. With that said, I checked the repository and the latest version is 1.0.7, however I am unsure of the changelog from 1.0.6.
Recently, the Unified firmware has been released which is the microcontroller firmware now available for OSPi and OSBo. For more information please visit: https://opensprinkler.com/forums/topic/announcing-opensprinkler-unified-firmware-2-1-3-for-avrrpibbblinux/
Thanks!