Allow default state to be collapsed

[anonymous]

For me this macro was not really useful until I modified it so that it displays as collapsed by default. The change is actually pretty simple, but I guess one would want it as parameter like the 'tag' and it might upset current users if the default behavior was overwritten.

Sadly my time does not allow to propose a finished patch, so I will just point out the idea: add the class collapsed in the outermost div using a new parameter: tag.div(... , class_="collapsed")

Now it works as I would expect and I want to thank you for the great plugin!

Tom K.

[anonymous]

Sounds like an easy patch and matches what I would logically assume to be the default as well (being collapsed). I'm going to modify this myself but I also lack the energy to create a PR/patch/etc.