d3 Line Chart problem

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Import/Export</title>
    <link rel="stylesheet" href="style.css">
    <script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>
  </head>
  <body>
      <div id="wait">Wait</div>
      <div id="ready">Ready</div>
 
      <div id="container"></div>
​
    <script src="script.js"></script>
  </body>
</html>
    

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js