Update basic instructions for 0.17

index.html

@@ -17,7 +17,7 @@
 </body>
 
 <script type="text/javascript">
-  var app = Elm.fullscreen(Elm.Main, {});
+  var app = Elm.Main.fullscreen();
 
   // Uncomment this line and comment out the above to enable elm-reactor support.
   // var app = Elm.fullscreenDebug("ElmHub", "ElmHub.elm");