Upgrade KillBill dependency to 0.18.21, base plugin 1.3.1, project version bump
Upgrade KillBill dependency to 0.18.21, base plugin 1.3.1, project version bump

upgrade KillBill dependency to 0.18.21, the killbill-base-plugin to 1.3.1, and bump the version of this project to 2.4-SNAPSHOT in light of these dependency changes.

Furthermore, remove the enforcer exclusion of cglib, because it is present in the dependency chain of the Kill Bill libraries.

OtoAnalytics/killbill-authnet-plugin