Added SourceVersion.

Author: Chessray

additions/src/main/java/uk/co/kleindelao/mapstruct/spring/converter/ConverterMapperProcessor.java

@@ -17,6 +17,7 @@
 import javax.annotation.processing.AbstractProcessor;
 import javax.annotation.processing.RoundEnvironment;
 import javax.annotation.processing.SupportedAnnotationTypes;
+import javax.lang.model.SourceVersion;
 import javax.lang.model.element.Element;
 import javax.lang.model.element.ExecutableElement;
 import javax.lang.model.element.TypeElement;
@@ -41,6 +42,11 @@ public class ConverterMapperProcessor extends AbstractProcessor {
   private final ConversionServiceBridgeGenerator bridgeGenerator =
       new ConversionServiceBridgeGenerator(Clock.systemUTC());
 
+  @Override
+  public SourceVersion getSupportedSourceVersion() {
+    return SourceVersion.latestSupported();
+  }
+
   @Override
   public boolean process(
       final Set<? extends TypeElement> annotations, final RoundEnvironment roundEnv) {