Title on two lines in addTitle()

[adhi-r]

Hi, thanks for your work on this package. addTitle really helped me as I don't really know HTML/CSS.

One thing though, if the title is any longer than a few words, the title breaks out into two lines. How can I prevent that from happening? I've found some HTML stuff on StackOverflow but I don't know how to incorporate it into leaflet.

谢谢您！我会汉语，（一点点。。。） 因为我度汉语四年。