docs: add bjlittle as a contributor for code

[allcontributors[bot]]

Adds @bjlittle as a contributor for code.

This was requested by bjlittle in this comment

[codecov[bot]]

Codecov Report

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

Project coverage is 91.30%. Comparing base (12751bc) to head (618f343).

:exclamation: Current head 618f343 differs from pull request most recent head d95a6ce

Please upload reports for the commit d95a6ce to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #891 +/- ## ======================================= Coverage 91.30% 91.30% ======================================= Files 58 58 Lines 2934 2934 ======================================= Hits 2679 2679 Misses 255 255 ```

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