Mudar ação do dropdown de click para hover na versão 4.1+ Change action of dropdown of click to hover in version 4.1+

bootstrap-4.1-dropdown-hover.js

function toggleDropdown (e) {
        let _d = $(e.target).closest('.dropdown'),
            _m = $('.dropdown-menu', _d);
        setTimeout(function(){
            let shouldOpen = e.type !== 'click' && _d.is(':hover');
            _m.toggleClass('show', shouldOpen);
            _d.toggleClass('show', shouldOpen);
            $('[data-toggle="dropdown"]', _d).attr('aria-expanded', shouldOpen);
        }, e.type === 'mouseleave' ? 300 : 0);
    }

    $('body')
        .on('mouseenter mouseleave', '.dropdown', toggleDropdown)
        .on('click', '.dropdown-menu a', toggleDropdown);