v1.0.0

The long overdue v1.0‼

The processor no longer claims the annotation (in accordance with https://errorprone.info/bugpattern/DoNotClaimAnnotations)

v0.3

• Annotation now has class retention; this enables Gradle incremental processing (kind of ironic that it wasn't the case; it used to be for another reason though)
• Processor checks that the annotated class is not abstract
• Processor checks that dynamic processors override getSupportedOptions()

v0.2

Fix IncrementalAnnotationProcessorType.getProcessorOption() values. They were returning bad values, making DYNAMIC processors using them from getSupportedOptions() actually never incremental (as can be seen in auto-value 1.6.3rc1).