v0.1.2 Add `usage` tag for optionall help in command line args mode

What's Changed

• Add coverage for error cases by @DenisPalnitsky in #19
• Add tag for usage by @MMolineux in #20
• Fix lint issues by @DenisPalnitsky in #21

New Contributors

• @MMolineux made their first contribution in #20

Full Changelog: v0.1.2...v0.1.3