change args to point to the settings.toml

[ahawkes]

Description

Change args to point at settings.toml

Fixes #75

Type of change

• [x ] Bug fix (non-breaking change to fix an issue)
• [ ] New feature (non-breaking change to add functionality)
• [ ] Refactoring (non-breaking, non-functional change to improve maintainability)
• [ ] Optimization (non-breaking change to speed up the code)
• [ ] Breaking change (whatever its nature)
• [ ] Documentation (improve or add documentation)

Key checklist

• [ ] All tests pass: $ cargo test
• [ ] The documentation builds and looks OK: $ cargo doc

Further checks

• [ ] Code is commented, particularly in hard-to-understand areas
• [ ] Tests added that prove fix is effective or that feature works

[alexdewar]

LGTM! Must have forgotten to update these...

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.81%. Comparing base (0aed712) to head (7d91312).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #76 +/- ## ======================================= Coverage 81.81% 81.81% ======================================= Files 7 7 Lines 77 77 ======================================= Hits 63 63 Misses 14 14 ```

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