Can not Load </b> from xl/styles.xml

[hans-cn]

styles.xml source data:

When open a existing file && save, data will be:

Then, the cell will be lost "B" style. I think the following fields have the same problem：

type xlsxFont struct {
B *attrValBool xml:"b,omitempty"
I *attrValBool xml:"i,omitempty"
Strike *attrValBool xml:"strike,omitempty"
Outline *attrValBool xml:"outline,omitempty"
Shadow *attrValBool xml:"shadow,omitempty"
Condense *attrValBool xml:"condense,omitempty"
Extend *attrValBool xml:"extend,omitempty"
...

[xuri]

Thanks for your issue. I have fixed it, please try upgrading to the master branch code, and this patch will be released in the next version.