text: Title: Update Documentation for Flask >= 1.1.0 and Werkzeug >= 0.15.0
  Body: > d-kahara commented 2 hours ago • 
  > For anyone that's encountered this issue lately
  > This has changed
  > 
  > from werkzeug.contrib.fixers import ProxyFix
  > app.wsgi_app = ProxyFix(app.wsgi_app)
  > 
  > This is what you need:
  > 
  > from werkzeug.middleware.proxy_fix import ProxyFix
  > app.wsgi_app = ProxyFix(app.wsgi_app, x_proto=1, x_host=1)
  > 
  > @noirbizarre perhaps this could also be rectified in the todo example?
  
  
  This appears to be a refactor in Werkzeug 0.15.X series. This version is taken by flask >= 1.1.0
  
  We should look at updating our example and documentation, along with compatibility notes. Sidebar, we should also consider locking to more specific versions of dependencies in case of breaking changes (since Flask 1.0.0 came out, and we're allowing >0.8.0. Some big changes happened in there :) )