Regression in opacity/hue settings

[oheil]

https://github.com/JuliaGraphics/Luxor.jl/issues/256

[codecov[bot]]

Codecov Report

Base: 74.61% // Head: 74.63% // Increases project coverage by +0.02% :tada:

Coverage data is based on head (602a694) compared to base (ade003d). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #257 +/- ## ========================================== + Coverage 74.61% 74.63% +0.02% ========================================== Files 33 33 Lines 6476 6482 +6 ========================================== + Hits 4832 4838 +6 Misses 1644 1644 ``` | [Impacted Files](https://codecov.io/gh/JuliaGraphics/Luxor.jl/pull/257?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaGraphics) | Coverage Δ | | |---|---|---| | [src/drawings.jl](https://codecov.io/gh/JuliaGraphics/Luxor.jl/pull/257?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaGraphics#diff-c3JjL2RyYXdpbmdzLmps) | `78.32% <100.00%> (+0.34%)` | :arrow_up: | 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=JuliaGraphics). 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=JuliaGraphics)

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[cormullion]

Thanks! Will try test a bit more tomorrow.