Please update dragula to 3.7.3

[Arthesian]

A new version of Dragula got released, which enabled settings for drag detection offset (slideFactorX, slideFactorY)

If the dependency could get updated to the latest version, that would be nice.

[Arthesian]

I have created a Pull Request in which this update has been made : #47

[LeCoupa]

Can we merge this @Astray-git ?

[adiramardiani]

Thanks @Astray-git to merge to dragula 3.7.3

Can you update documentation example to follow all example from dragula it self ?