Support dot-notation for changelog option

[philipostli]

I have added support for dot-notation to be used on the changelog option.
This will allow for translations to be added to changelog from a github action running the homey cli.

Example:
homey app version patch --changelog.en "Added feature" --changelog.no "Ny funksjon" --commit

Will add:
{
"en": "Added feature",
"no": "Ny funksjon"
}

to the .homechangelog.json-file, and no breaking changes because:
homey app version patch --changelog "Added feature" --commit
will still add the string to "en" tag as before.

Commit message will use from "en" tag as before.