use Aqua for meta test

[johnnychen94]

And also fixes the ambiguity issue, which is separated from #157

The compat for CSV 0.8 is for test purposes.

[codecov]

Codecov Report

Merging #165 (cbfb8f4) into master (edd2078) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #165      +/-   ##
==========================================
- Coverage   66.43%   66.42%   -0.01%     
==========================================
  Files          10       10              
  Lines         566      563       -3     
==========================================
- Hits          376      374       -2     
+ Misses        190      189       -1     

Impacted Files	Coverage Δ
src/colorchannels.jl	48.93% <ø> (-0.37%)	⬇️

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