merge method concatenates two PDF's but with a header line

[dannielperez]

Please add in PDFMerger.php in line 77

$fpdi->setPrintHeader(false); // added to fix line on top of concatenated PDF's

bellow

$fpdi = new FPDI;

This is to fix the undesired header line that comes form default header in fpdi.

Thanks,
Danniel Perez