Update to StatsModels 0.7

[codecov-commenter]

Codecov Report

Patch coverage: 89.55% and project coverage change: -0.47 :warning:

Comparison is base (cfdef87) 96.00% compared to head (edab259) 95.54%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #220 +/- ## ========================================== - Coverage 96.00% 95.54% -0.47% ========================================== Files 8 7 -1 Lines 651 606 -45 ========================================== - Hits 625 579 -46 - Misses 26 27 +1 ``` | [Impacted Files](https://codecov.io/gh/FixedEffects/FixedEffectModels.jl/pull/220?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [src/partial\_out.jl](https://codecov.io/gh/FixedEffects/FixedEffectModels.jl/pull/220?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL3BhcnRpYWxfb3V0Lmps) | `95.58% <ø> (ø)` | | | [src/FixedEffectModel.jl](https://codecov.io/gh/FixedEffects/FixedEffectModels.jl/pull/220?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL0ZpeGVkRWZmZWN0TW9kZWwuamw=) | `90.24% <88.70%> (-2.84%)` | :arrow_down: | | [src/fit.jl](https://codecov.io/gh/FixedEffects/FixedEffectModels.jl/pull/220?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL2ZpdC5qbA==) | `96.35% <100.00%> (ø)` | | | [src/utils/formula.jl](https://codecov.io/gh/FixedEffects/FixedEffectModels.jl/pull/220?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL3V0aWxzL2Zvcm11bGEuamw=) | `100.00% <100.00%> (ø)` | | ... and [1 file with indirect coverage changes](https://codecov.io/gh/FixedEffects/FixedEffectModels.jl/pull/220/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) 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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