"dropdown-item" css class is used for Bootstrap 3, which is not there

[kinguru]

Describe the bug
Use { bootstrapVersion: 3 } options
The dropdown rendered is ugly. The reason - there is no "dropdown-item" class in Bootstrap3.

To Reproduce
HTML

JS
$('.basicAutoComplete').autoComplete({
bootstrapVersion: 3
});
Actual result: the dropdown looks ugly

Expected behavior
use appropriate css classes for BS3

Screenshots

Desktop (please complete the following information):

• OS: windows 10
• Browser chrome
• Version chrome 91, bootstrap-autocomplete 2.3.7

Comments
In case is use bootstrapVersion: "3"
the UL element is not visible. (disaply:none in debugger)

prototype.show() is not called
prototype.hide() is called ok

Do you have a demo for BS3?