add an option to set the autocomplete value for the input field

[amiram]

Browsers do not disable autocomplete if you set it to off, for example in Chrome. When you use ngx-select with a list and a search field, once you put the focus on the field, the browser shows its own autocomplete list which covers the list of ngx-select. To disable to list you can use autocomplete="blabla". This pull request allows you to do that.

<ngx-select
     [items]="items"
     optionTextField="textProp"
     optionValueField="valueProp"
     autocomplete="blabla">
</ngx-select>

[optimistex]

@amiram Hi. Thank you for the maintain. I'll check and release it after my vacation, approximately in 2 weeks.

[optimistex]

Released!

[amiram]

Thanks @optimistex !