[Bug]: Too restrictive typings for TomLoadCallback

[SWICRIOT]

Bug description

Examples for loading remote data shows the callback taking one and zero arguments. Typescript typings have defined TomLoadCallback to take two arguments : loadCallback(options: TomOption[], optgroups: TomOption[]): void;

Expected behavior

Typings should treat all parameters as optional.

Steps to reproduce

Use the following code in TypeScript

new TomSelect(accountSelect, {
    load: function (query: string, callback: TomLoadCallback)
    {
        var url = 'https://api.github.com/search/repositories?q=' + encodeURIComponent(query);
        fetch(url)
            .then(response => response.json())
            .then(json =>
            {
                callback(json.items);
            }).catch(() =>
            {
                callback();
            });
    }
});

This will show errors for the usage of callback.

Additional context

N/A