Coding Matrix in Rust | 2023-02-08

This time: * Trying to get Arnie to remember what time to greet us, and to do that, we needed to do: * Expressing a time range within which to choose a random time as a struct * Persuading the HumanCommand parser to accept that "" is a valid argument Next time: * Finish off getting Arnie to greet us at a time of our choosing