Support changing version in specified keys in data files

[tyler-jachetta]

It would be helpful at times if the bump and set actions could take options to allow setting values in structured data files in addition to the other actions taken.

I'd propose `--set_(?:json|yaml)=:path.to.key

The use case is for the current ansible artifact generation.

[tyler-jachetta]

The human readable text around the version isn't a complete blocker, I can parse it out, but that feels brittle (and for set, won't work this way until #71 is resolved.

[otakup0pe]

@ultimatealf this is kinda what I was talking about earlier today in terms of auto editing associated/arbitrary yaml version pinning files.

[ultimatealf]

Seems like a natural fit that we have been considering (at least for a week according to github) :)
That would make editing a data file with the new desired version (and sha) pretty trivial.

[tyler-jachetta]

I didn't even think that it could deal with the painter stuff, yeah this simplifies that a lot wait no it doesn't really solve it the way I was thinking.