correctly overload 3 arg show

[KristofferC]

Looking back at this I think this is how you are supposed to do it. Would be good to see if this is breaking for how packages use this.

[codecov-commenter]

Codecov Report

Merging #43 into master will decrease coverage by 2.23%. The diff coverage is 73.91%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
- Coverage   88.25%   86.02%   -2.24%     
==========================================
  Files           8        8              
  Lines         298      322      +24     
==========================================
+ Hits          263      277      +14     
- Misses         35       45      +10     

Impacted Files	Coverage Δ
src/downcasts.jl	93.54% <50.00%> (+0.44%)	:arrow_up:
src/crayon_stack.jl	95.65% <66.66%> (-4.35%)	:arrow_down:
src/crayon_wrapper.jl	58.33% <72.72%> (-33.98%)	:arrow_down:
src/crayon.jl	89.47% <85.71%> (+0.28%)	:arrow_up:
src/logo.jl	100.00% <0.00%> (ø)
src/macro.jl	83.33% <0.00%> (+0.43%)	:arrow_up:
... and 1 more

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