Fix properties method

[nymous]

Description

Fix artifacts.properties() method, and add a artifacts.info() method that returns what the old .properties() returned.

Fixes #50

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] This change requires a documentation update

How has it been tested ?

Unit tests have been added for the fixed .properties() method, for the new .info(), and fixed for methods depending on the old .properties() behavior.

Checklist:

• [x] My PR is ready for prime time! Otherwise use the "Draft PR" feature
• [x] All commits have a correct title
• [x] Readme has been updated
• [x] Quality tests are green (see Codacy)
• [x] Automated tests are green (see pipeline)