Plugin is not compatible with Gradle 6.4 #49
Description
Currently, due to the dependency on the oldish version of the spine-base, the plugin is not compatible with the latest Gradle versions.
AFAIK, the issue is in the usage of the UnionFileCollection within GradleTask$Builder.withInputFiles. The issue is already resolved in spine-base as part of the SpineEventEngine/base-libraries#532.
Maybe it is a good idea to point somewhere the supported Gradle versions?