title: Nancy basic auth password change causes authentication to fail
body: <p>I have created a self-hosting site using Nancy and Owin. I used Nancy.BasicAuthentication for authentication. Everything works fine until I change the current logged in user's password.</p>
  
  <p>Once the password is changed, if the user creates a request then they are redirected to the 404 error page and the window pops up asking for a username and password.</p>
  
  <p>How can I update the user's credentials after a password change to stop them from losing authentication?</p>
  
  <p>Thanks!</p>