Release 2.4.0 - Ohhh, so that's how submodules work!

Turns out I've been using submodules under some bad assumptions. I assumed submodules would just stay up-to-date without any human intervention, but as it turns out, that's not the case.

So, we haven't actually updated the Bulma version since August 2020. Sorry about that.

To solve this, I had to run git submodule update --recursive --remote, and this went through and updated all the submodules to the latest commit.

So now, django-simple-bulma is finally running Bulma 0.9.2. 🎉