PdfRendererBuilder's run method closes the OutputStream passed using the toStream method

The documentation of the ```PdfRendererBuilder```'s ```toStream``` method states that when calling the ```run``` method, the passed ```OutputStream``` will not be closed.
That's not true in practice : the ```createPdf``` / ```createPdfFast``` methods of the ```PdfBoxRenderer``` class both call ```_pdfDoc.save(os);```, which itself closes the OutputStream.

My workaround is to wrap my outputstream in a FilterOutputStream on which I override the close method :

```java
OutputStream pdfOutput = ... //my original outputstream
OutputStream nonCloseablePdfOutput = new FilterOutputStream(pdfOutput) {
@Override
public void close() throws IOException {
//openhtmltopdf has a bug where it closes the stream at the end of the "run" method
//even though the documentation states otherwise.
}
};

builder.toStream(nonCloseablePdfOutput);

```