Feature request - allow users to pass titles to `knowyourdata.kyd`

I'm currently using `knowyourdata.kyd` to report stats of multiple variables in Jupyter notebooks.  It would be convenient to be able to print a user-defined title or caption to let me know what each one refers to at a glance, something like:

```
import kyd
data = ...
kyd.kyd(data, title=r'This is my data $(\mathrm{cm / s}^2)$')
```