todo : change arrayof to children and arrayof(n)[end] to lastchild

[karan0299]

Complete TODO to change arrayof to children and arrayof(n)[end] to lastchild

[codecov-io]

Codecov Report

❌ Patch coverage is 62.50000% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.90%. Comparing base (2dd9b36) to head (f0095ff).
⚠️ Report is 13 commits behind head on master.

Files with missing lines	Patch %	Lines
src/BitmappedVectorTrie.jl	62.50%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
- Coverage   77.30%   76.90%   -0.41%     
==========================================
  Files           7        7              
  Lines         379      381       +2     
==========================================
  Hits          293      293              
- Misses         86       88       +2     

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