Update fit.jl

[codecov-commenter]

Codecov Report

Base: 95.94% // Head: 95.94% // Decreases project coverage by -0.01% :warning:

Coverage data is based on head (a7783fe) compared to base (06d9b61). Patch coverage: 100.00% of modified lines in pull request are covered.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #218 +/- ## ========================================== - Coverage 95.94% 95.94% -0.01% ========================================== Files 8 7 -1 Lines 617 616 -1 ========================================== - Hits 592 591 -1 Misses 25 25 ``` | [Impacted Files](https://codecov.io/gh/FixedEffects/FixedEffectModels.jl/pull/218?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [src/fit.jl](https://codecov.io/gh/FixedEffects/FixedEffectModels.jl/pull/218?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL2ZpdC5qbA==) | `96.42% <100.00%> (ø)` | | | [src/FixedEffectModels.jl](https://codecov.io/gh/FixedEffects/FixedEffectModels.jl/pull/218?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL0ZpeGVkRWZmZWN0TW9kZWxzLmps) | | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None)

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