Solve issue#10. (#13)

* Solve issue#10.

Add log for  GameSession startup exception.

* Change requested completed.

src/MineCase.Gateway/Network/ConnectionRouter.cs

@@ -46,7 +46,7 @@ namespace MineCase.Gateway.Network
             }
             catch (Exception ex)
             {
-
+                _logger.LogError(default(EventId), ex, ex.Message);
             }
         }
     }