title: Keep history cached with WKWebView
body: <p>I am building a little app and I use a <code>WKWebView</code> to make the user able to navigate through web pages.</p>
  
  <p>The problem I have is that whenever a user wants to go back to the previous visited page, this page has to be reloaded.</p>
  
  <p>My question: is there a way to cache the content of every pages of the <code>WKWebView</code>'s history stack so navigating through the history wouldn't make all the pages load again ?</p>