minor fix to enable float step value

[mayalenE]

The 'handle_min_change' and 'handle_max_change' currently parse values to integers preventing the use of float step values (eg step=0.1).

The proposed suggestion enables to have float min/max values such that the step argument acts as in the original Slider gradio component.

[freddyaboulton]

Released in version 0.0.5