printnode for AbstractDict and AbstractArray

[joshday]

Generalizing existing methods for Dict and Vector to their abstract types.

[codecov-io]

Codecov Report

Merging #52 into master will decrease coverage by 2.47%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #52      +/-   ##
==========================================
- Coverage   63.66%   61.19%   -2.48%     
==========================================
  Files           6        6              
  Lines         322      335      +13     
==========================================
  Hits          205      205              
- Misses        117      130      +13     

Impacted Files	Coverage Δ
src/AbstractTrees.jl	36.36% <100.00%> (+3.03%)	⬆️
src/traits.jl	81.81% <0.00%> (-3.90%)	⬇️
src/indexing.jl	14.89% <0.00%> (-2.61%)	⬇️
src/iteration.jl	58.88% <0.00%> (-2.04%)	⬇️

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[timholy]

Thanks!