Default row height compatibility with Apache OpenOffice and Kingsoft WPS, unit test update and typo fixed

fix Hyperlinks update error

Fixed GetCellValue percentage accuracy

修复获取百分比值时，GetCellValue返回值不准确的问题

* Fix comment shape compatibility issue

* Using Go modules with Travis CI

* Update .travis.yml
Co-authored-by: NCanh Nguyen <nguyenxc@seagroup.com>
Co-authored-by: xuri <xuri.me@gmail.com>

* Resolve #661 Add Logarithmic scale option support on Y axis

Example usage:
Add the following option into the format string when using AddChart:

"y_axis":{"scaling":{"logbase":"10"}}

* Change type of LogBase from attrValString to attrVarFloat

* Add test case for testing Logarithmic Option in Y axis of charts

* Move field `LogBase` in the format string up one level (remove `Scaling`) as suggested the owner

Test cases are updated accordingly.

Implement columns iterator

escape html tag