Shift click with custom checkboxes

[rbague]

I just set up this library with bootstrap custom checkboxes, and everything works fine except the shift click functionality.
After investigating this is probably because onMouseDown checks that the event target has the data-check-all-item attribute, which is not the case as bootstrap hides the input and displays the checkbox in the label's :before and :after pseude-elements, causing the event.target to be the label, which does not have the attribute.

It might happen the same with other CSS libraries that use a similiar approach to change the checkbox design like Semantic UI or iCheck.

I don't know if there is an easy fix or of it is worth it, but in that case it might be required to explain it in the README.

Here is a simple example so you can see the behaviour I'm describing: https://codesandbox.io/s/githubcheck-all-bootstrap-custom-checkboxes-76jv5

[muan]

Thanks for the report. With 0.4.0 this should be fixed. See #18 for the issues around text selection & firefox though.

[rbague]

Awesome, thanks!