Support writing dates

[green-nsk]

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[codecov-commenter]

Codecov Report

Merging #19 (efbc8b7) into master (2ac033a) will decrease coverage by 0.85%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #19      +/-   ##
==========================================
- Coverage   92.20%   91.34%   -0.86%     
==========================================
  Files          13       13              
  Lines         795      797       +2     
==========================================
- Hits          733      728       -5     
- Misses         62       69       +7     

Flag	Coverage Δ
unittest	91.34% <100.00%> (-0.86%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/reader.jl	92.42% <100.00%> (+0.02%)	⬆️
src/types.jl	100.00% <100.00%> (ø)
src/writer.jl	97.29% <100.00%> (+0.01%)	⬆️
src/object_id.jl	76.74% <0.00%> (-16.28%)	⬇️
src/LightBSON.jl	100.00% <0.00%> (ø)

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