Investigate lower dependencies #187
Description
We should have an explicitly stated reason for each dependency minimum version, so users/packagers know that it is not arbitrary.
And have a CI job which uses the minimum version, to avoid any bugs with specific minimum versions.
And ideally also have a job which uses random versions between minimum and most recent, to flush out any bugs with specific versions.
@pyexcel had a job with minimum version, and maybe had random versions also.