fix(core): report supported source version dynamically in annotation processor (#930)

Author: bercianor

core/flamingock-processor/src/main/java/io/flamingock/core/processor/FlamingockAnnotationProcessor.java

@@ -36,7 +36,6 @@
 import javax.annotation.processing.AbstractProcessor;
 import javax.annotation.processing.ProcessingEnvironment;
 import javax.annotation.processing.RoundEnvironment;
-import javax.annotation.processing.SupportedSourceVersion;
 import javax.lang.model.SourceVersion;
 import javax.lang.model.element.TypeElement;
 import java.io.File;
@@ -118,7 +117,6 @@
  * @version 2.0
  * @since Flamingock v1.x
  */
-@SupportedSourceVersion(SourceVersion.RELEASE_8)
 public class FlamingockAnnotationProcessor extends AbstractProcessor {
 
     private static final String RESOURCES_PATH_ARG = "flamingock.resources";
@@ -167,6 +165,11 @@ public Set<String> getSupportedAnnotationTypes() {
         ));
     }
 
+    @Override
+    public SourceVersion getSupportedSourceVersion() {
+        return SourceVersion.latestSupported();
+    }
+
     @Override
     public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
         if (roundEnv.processingOver()) {