A few differences on the interfaces's exercise

[gabelula]

The instructions in the comments of the template:

https://github.com/ardanlabs/gotraining/blob/master/topics/interfaces/exercises/template1/template1.go

are slightly different than in the exercise's instructions:

https://github.com/ardanlabs/gotraining/tree/master/topics/interfaces

[ardan-bkennedy]

Thanks for the issue. I updated the example and fixed the instructions.