Using YAML for config files

[atc0005]

https://goinbigdata.com/persisting-application-configuration-in-golang/

Good example there.

I'm currently using TOML as the config file format for all of my projects (where a config file is used/supported), but there is at least one case where YAML's structured format is likely to be easier to work with.

On my "TODO" list to implement/learn.