sbt-pgp 1.1.2 is published for sbt 0.13 and sbt 1.x.
sbt-pgp 1.1.2 features a fix by Ruben Vorderman to adopt to GNU PG >= 2.1, which uses
pubring.kbx. This is aimed to fix the long standing issue #72.
gpgAncient was added that you can set to true if you want to old behavior.