Config file parent directories lookup

[kdeldycke]

See:

• callowayproject/bump-my-version#8
• c4urself/bump2version#225

[kdeldycke]

This would be an parameter to the --config decorator, that could be named recursive_parent_search=False or something like that.

It would work by looking for the same pattern file (like *.{yaml,json,ini}) in the parent directory if the current one does not contain the configuration file. And again in the parent's parent directory is not found. Until we do not have access to the directory or reach the root.

[kdeldycke]

This is different from #581, which is about merging hierarchical configuration files.