Changes equality to approximate equality in test set

[zygmuntszpak]

Also updated Documenter.jl to version 0.23

[johnnychen94]

Ref: N0f8->Float conversion is changed in JuliaMath/FixedPointNumbers.jl#138

[codecov]

Codecov Report

Merging #31 into master will not change coverage by %.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #31   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines          206       244   +38     
=========================================
+ Hits           206       244   +38     

Impacted Files	Coverage Δ
src/yen.jl	100.00% <0.00%> (ø)
src/otsu.jl	100.00% <0.00%> (ø)
src/common.jl	100.00% <0.00%> (ø)
src/minimum.jl	100.00% <0.00%> (ø)
src/moments.jl	100.00% <0.00%> (ø)
src/unimodal.jl	100.00% <0.00%> (ø)
src/minimum_error.jl	100.00% <0.00%> (ø)
src/balancedthreshold.jl	100.00% <0.00%> (ø)
src/entropy_thresholding.jl	100.00% <0.00%> (ø)

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