add an y argument to gglikert

[codecov[bot]]

Codecov Report

Patch coverage: 96.66% and project coverage change: -0.04 :warning:

Comparison is base (cd60ba3) 95.48% compared to head (cab68f4) 95.45%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #31 +/- ## ========================================== - Coverage 95.48% 95.45% -0.04% ========================================== Files 12 12 Lines 820 836 +16 ========================================== + Hits 783 798 +15 - Misses 37 38 +1 ``` | [Impacted Files](https://codecov.io/gh/larmarange/ggstats/pull/31?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Joseph+Larmarange) | Coverage Δ | | |---|---|---| | [R/gglikert.R](https://codecov.io/gh/larmarange/ggstats/pull/31?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Joseph+Larmarange#diff-Ui9nZ2xpa2VydC5S) | `95.37% <96.29%> (-0.10%)` | :arrow_down: | | [R/weighted\_quantile.R](https://codecov.io/gh/larmarange/ggstats/pull/31?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Joseph+Larmarange#diff-Ui93ZWlnaHRlZF9xdWFudGlsZS5S) | `88.09% <100.00%> (ø)` | |

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