Merge pull request #70 from Aries1989/master

Thank for reporting.
I merged into the [dev79](https://github.com/QtExcel/QXlsx/tree/dev79) branch.
I will later merge the dev79 branch into the master branch.

Author: j2doll

QXlsx/source/xlsxworksheet.cpp

@@ -1027,6 +1027,7 @@ bool Worksheet::writeHyperlink(int row, int column, const QUrl &url, const Forma
 	Format fmt = format.isValid() ? format : d->cellFormat(row, column);
 	//Given a default style for hyperlink
 	if (!fmt.isValid()) {
+		fmt.setVerticalAlignment(Format::AlignVCenter);
 		fmt.setFontColor(Qt::blue);
 		fmt.setFontUnderline(Format::FontUnderlineSingle);
 	}