title: How to run code after some delay in Flutter?
body: <p>I'd like to execute a function after a certain delay after my Widget is built. What's the idiomatic way of doing this in Flutter? </p>
  
  <p>What I'm trying to achieve:
  I'd like to start with a default <code>FlutterLogo</code> Widget and then change its <code>style</code> property after some duration. </p>