title: Flowtype "Not covered by Flow" on object property chains
body: <p>I'm trying to use Flow, but I keep getting the "Not covered by Flow" warning, so my code is mostly underlined. I checked the Flow documentation, but it wasn't helpful regarding object property chaining, so <strong>how do you get something like this to work?</strong></p>
  
  <p><img src="https://cloud.githubusercontent.com/assets/3304303/16505429/c9201144-3ed1-11e6-8a83-4f93ce559c39.png" alt="image"></p>