Deprecate update-checksum's --deep option and change the default behaviour same as --deep option
Feature Overview
Change the default behaviour of update-checksum same as --deep option.
We keep --deep option in aqua v2 for the compatibility.
We will remove --deep option in aqua v3.
Why is the feature needed?
To make update-checksum simple.
If checksum file isn't provided aqua update-checksum doesn't get checksums.
This behaviour is confusing and bothering.
How to migrate
Please stop using --deep option.
aqua v2 still keeps --deep option but this option doesn't change anything.
This option would be removed in aqua v3.