Update examples

[jishnub]

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[codecov]

Codecov Report

Merging #16 (2971586) into master (dd29059) will decrease coverage by 0.42%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
- Coverage   99.88%   99.45%   -0.43%     
==========================================
  Files           6        6              
  Lines         874      924      +50     
==========================================
+ Hits          873      919      +46     
- Misses          1        5       +4     

Impacted Files	Coverage Δ
src/clusterquery.jl	98.18% <0.00%> (-1.82%)	⬇️
src/mapreduce.jl	98.24% <0.00%> (-1.76%)	⬇️
src/productsplit.jl	100.00% <0.00%> (ø)
src/reductionfunctions.jl	100.00% <0.00%> (ø)
src/trees.jl	99.71% <0.00%> (+0.01%)	⬆️

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