🐛 Closes #74 - @JsonIgnore at getData() method to avoid duplication for json encode

Signed-off-by: Fabio José <fabiojose@gmail.com>

api/src/main/java/io/cloudevents/v1/CloudEventImpl.java

@@ -102,6 +102,7 @@ public class CloudEventImpl<T> implements CloudEvent<AttributesImpl, T> {
 	}
 
 	@Override
+	@JsonIgnore
 	public Optional<T> getData() {
 		return Optional.ofNullable(data);
 	}