showStep event stepDirection is always "backward"

[RocketSquirrel]

Describe the bug
showStep event handler parameter stepDirection is always "backward" even when navigating forward.

To Reproduce
Steps to reproduce the behavior:

1. Click next
2. log stepDirection
3. Observe that the value is always "backward"

Expected behavior
In v4 when navigating forward the stepDirection value was "forward"

Desktop (please complete the following information):
Tested on Chrome Version 83.0.4103.106 (Official Build) (64-bit) and Firefox 77.0.1 (64-bit)

[techlab]

The issue is fixed on v5.1.1.
Thanks for reporting the issue @RocketSquirrel