add joshgillies as a contributor for code

[allcontributors[bot]]

Adds @joshgillies as a contributor for code.

This was requested by KnorpelSenf in this comment

[codecov[bot]]

Codecov Report

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

Comparison is base (142f68d) 46.06% compared to head (4856a9d) 46.06%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #529 +/- ## ======================================= Coverage 46.06% 46.06% ======================================= Files 19 19 Lines 6050 6050 Branches 320 320 ======================================= Hits 2787 2787 Misses 3260 3260 Partials 3 3 ```

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