Custom holiday days!

[Musa Almatri]

Thanks for this great library.
It's really amazing how I can customize it as I need.
But my problem is the holiday in my country is Friday and Saturday
Is there any way to customize the holiday days?

[Shohei Yokoyama]

@almatri
You can change month titles and holidayColor.
More details can be found here: First day of week