FlowableMultiInstanceActivityEventImpl#isSequential() typo issue

[chuntungho]

The method isSequential return false regardless of the value set.

public class FlowableMultiInstanceActivityEventImpl extends FlowableActivityEventImpl implements FlowableMultiInstanceActivityEvent{
    protected boolean sequential;

    public FlowableMultiInstanceActivityEventImpl(FlowableEngineEventType type) {
        super(type);
    }

    public void setSequential(boolean sequential) {
        this.sequential = sequential;
    }

    @Override
    public boolean isSequential() {
        return false;
    }

}