Remove newline in TicTacToe example

Summary: Really just for testing the shipit bot :)
Closes https://github.com/facebook/react-native/pull/4434

Reviewed By: svcscm

Differential Revision: D2703503

Pulled By: mkonicek

fb-gh-sync-id: 4b93638e01eaf86d63c429e6797d08095c4824ee

Examples/TicTacToe/TicTacToeApp.js

@@ -89,7 +89,6 @@ class Board {
         }
       }
     }
-
     return this.winner() === null;
   }
 }