docs: add jacobbieker as a contributor for code

[allcontributors[bot]]

Adds @jacobbieker as a contributor for code.

This was requested by peterdudfield in this comment

[skip ci]

[peterdudfield]

@all-contributors please add @peterdudfield for code @all-contributors please add @thomasarmstrong98 for code @all-contributors please add @vrym2 for code

[allcontributors[bot]]

@peterdudfield

I've put up a pull request to add @peterdudfield! :tada:

I've put up a pull request to add @thomasarmstrong98! :tada:

I've put up a pull request to add @vrym2! :tada: