y.level argument for ggcoef_multinom()

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (84e033d) 95.53% compared to head (624f96a) 95.53%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #36 +/- ## ======================================= Coverage 95.53% 95.53% ======================================= Files 12 12 Lines 963 963 ======================================= Hits 920 920 Misses 43 43 ``` | [Files Changed](https://app.codecov.io/gh/larmarange/ggstats/pull/36?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Joseph+Larmarange) | Coverage Δ | | |---|---|---| | [R/ggcoef\_model.R](https://app.codecov.io/gh/larmarange/ggstats/pull/36?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Joseph+Larmarange#diff-Ui9nZ2NvZWZfbW9kZWwuUg==) | `98.24% <100.00%> (ø)` | |

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