Select2 v4.0 add 'searchInputPlaceholder' option

Select2 v4.0 add 'searchInputPlaceholder' option

HTML

<script src="https://cdn.jsdelivr.net/npm/select2@4.0.13/dist/js/select2.js"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/select2@4.0.13/dist/css/select2.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/7.0.0/normalize.css">
<script src="https://andreivictor.ro/select2-searchInputPlaceholder.js"></script>
<select class="js-source-states">
  <optgroup label="Alaskan/Hawaiian Time Zone">
    <option value="AK">Alaska</option>
    <option value="HI">Hawaii</option>
  </optgroup>
  <optgroup label="Pacific Time Zone">
    <option value="CA">California</option>
    <option value="NV">Nevada</option>
    <option value="OR">Oregon</option>
    <option value="WA">Washington</option>
  </optgroup>
  <optgroup label="Mountain Time Zone">
    <option value="AZ">Arizona</option>
    <option value="CO">Colorado</option>
    <option value="ID">Idaho</option>
    <option value="MT">Montana</option>
    <option value="NE">Nebraska</option>
    <option value="NM">New Mexico</option>
    <option value="ND">North Dakota</option>
    <option value="UT">Utah</option>
    <option value="WY">Wyoming</option>
  </optgroup>
  <optgroup label="Central Time Zone">
    <option value="AL">Alabama</option>
    <option value="AR">Arkansas</option>
    <option value="IL">Illinois</option>
    <option value="IA">Iowa</option>
    <option value="KS">Kansas</option>
    <option value="KY">Kentucky</option>
    <option value="LA">Louisiana</option>
    <option value="MN">Minnesota</option>
    <option value="MS">Mississippi</option>
    <option value="MO">Missouri</option>
    <option value="OK">Oklahoma</option>
    <option value="SD">South Dakota</option>
    <option value="TX">Texas</option>
    <option value="TN">Tennessee</option>
    <option value="WI">Wisconsin</option>
  </optgroup>
  <optgroup label="Eastern Time Zone">
    <option value="CT">Connecticut</option>
    <option value="DE">Delaware</option>
    <option...

CSS

body {
    font-family: Arial, sans-serif;
    font-size: 12px;
}

select {
  width: 300px;
}

JavaScript

$(document).ready(function() {
  $(".js-source-states").select2({
  	searchInputPlaceholder: 'Search state...'
  });
});