Use .NET Core 2.2 in workshop (#29)
Use .NET Core 2.2 in workshop (#29)

* Changed .net core version to 2.2.
Code example is in 2.2.

* CustomerId is also used in CustomerRegistered

* Fixed typo

EdwinVW/pitstop,EdwinVW/pitstop,EdwinVW/pitstop,EdwinVW/pitstop,EdwinVW/pitstop