Use allunique

[devmotion]

This PR contains a minor optimization: Instead of computing unique(x) and comparing its length with the length of x, it just checks allunique(x).

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (932eaac) 93.75% compared to head (37ff520) 93.76%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #302   +/-   ##
=======================================
  Coverage   93.75%   93.76%           
=======================================
  Files          28       28           
  Lines        1729     1731    +2     
=======================================
+ Hits         1621     1623    +2     
  Misses        108      108           

Impacted Files	Coverage Δ
src/kolmogorov_smirnov.jl	96.15% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[nalimilan]

Thanks!