Function naming

[JackKrubb]

https://github.com/fordkuppp/vending/blob/f75a15931efb8d59312574430e38286e9de15672/vending/api.py#L20

• Consider changing the function name to something that explicitly states what the function does to improve readability Example: get_all_machines()

[fordkuppp]

Flask-RESTful requires function to be named as such. It's HTTP get method.