ggcoef_table() improvement

[larmarange]

fix #34

[codecov[bot]]

Codecov Report

Patch coverage: 96.06% and project coverage change: +0.03% :tada:

Comparison is base (46d8df2) 95.50% compared to head (7e71162) 95.53%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #35 +/- ## ========================================== + Coverage 95.50% 95.53% +0.03% ========================================== Files 12 12 Lines 956 963 +7 ========================================== + Hits 913 920 +7 Misses 43 43 ``` | [Files Changed](https://app.codecov.io/gh/larmarange/ggstats/pull/35?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/35?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% <96.06%> (+0.02%)` | :arrow_up: |

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