Fix quantile plotting and allow passing plotting kwargs

[codecov[bot]]

Codecov Report

Merging #140 (61eefcf) into main (59ec405) will decrease coverage by 30.62%. The diff coverage is 0.00%.

@@             Coverage Diff             @@
##             main     #140       +/-   ##
===========================================
- Coverage   96.38%   65.77%   -30.62%     
===========================================
  Files           5        5               
  Lines         332      336        +4     
===========================================
- Hits          320      221       -99     
- Misses         12      115      +103     

Impacted Files	Coverage Δ
src/basics.jl	31.34% <0.00%> (-65.68%)	:arrow_down:
src/datafit.jl	0.00% <0.00%> (-96.00%)	:arrow_down:
src/sensitivity.jl	85.96% <0.00%> (-14.04%)	:arrow_down:
src/threshold.jl	87.17% <0.00%> (-7.70%)	:arrow_down:

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