Merge pull request phaserjs#3026 from chenfanggm/master

fix Game.prototype.constructor

Author: photonstorm

v3/src/boot/Game.js

@@ -81,8 +81,6 @@ var Game = function (config)
     window.game = this;
 };
 
-Game.prototype.constructor = Game;
-
 Game.prototype = {
 
     boot: function ()
@@ -169,4 +167,6 @@ Game.prototype = {
     }
 };
 
+Game.prototype.constructor = Game;
+
 module.exports = Game;