Various minor maintenance changes

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +1.05 :tada:

Comparison is base (2aaaa90) 92.61% compared to head (ba2d903) 93.66%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #86 +/- ## ========================================== + Coverage 92.61% 93.66% +1.05% ========================================== Files 3 3 Lines 379 379 ========================================== + Hits 351 355 +4 + Misses 28 24 -4 ``` | [Impacted Files](https://app.codecov.io/gh/chkwon/PATHSolver.jl/pull/86?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Changhyun+Kwon) | Coverage Δ | | |---|---|---| | [src/C\_API.jl](https://app.codecov.io/gh/chkwon/PATHSolver.jl/pull/86?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Changhyun+Kwon#diff-c3JjL0NfQVBJLmps) | `92.10% <ø> (-0.04%)` | :arrow_down: | | [src/PATHSolver.jl](https://app.codecov.io/gh/chkwon/PATHSolver.jl/pull/86?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Changhyun+Kwon#diff-c3JjL1BBVEhTb2x2ZXIuamw=) | `83.33% <ø> (+18.11%)` | :arrow_up: | | [src/MOI\_wrapper.jl](https://app.codecov.io/gh/chkwon/PATHSolver.jl/pull/86?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Changhyun+Kwon#diff-c3JjL01PSV93cmFwcGVyLmps) | `98.42% <100.00%> (ø)` | |

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