message: temporary fixed react js version for testcafe tests
diff: <html>
  <head>
  <title>Welcome to React</title>
  - <script src="https://unpkg.com/react@15/dist/react.js"></script>
  - <script src="https://unpkg.com/react-dom@15/dist/react-dom.js"></script>
  + <script src="https://unpkg.com/react@15.5.4/dist/react.js"></script>
  + <script src="https://unpkg.com/react-dom@15.5.4/dist/react-dom.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.23/browser.js"></script>
  <!-- dx charts -->
  