Perspective component still built with v0.1.1 of the gradle plugin; upgrade non-trivial

[magnus-puresalmon]

Heya, I was using your perspective component example as inspiration for a module and found that upgrading the io.ia.sdk.modl plugin that you maintain results in uh, a hard-to-fix error message

* What went wrong:
An exception occurred applying plugin request [id: 'org.gradle.java-library']
> Failed to apply plugin 'org.gradle.java-library'.
   > Could not create task ':common:collectModlDependencies'.
      > Could not create task of type 'CollectModlDependencies'.
         > Could not generate a decorated class for type CollectModlDependencies.
            > org/gradle/api/file/SyncSpec

It's specifically the combination of versions past v0.1.1 (verified with 0.2.0, 0.3.0, 0.4.0 and 0.4.1) and calling the java-library plugin in the sub-project folders, a fact I only uncovered by chance when I tried updating an older module that didn't use the java-library plugin.

What's the intended modification here?