implement slice unique elemets assertsion

[ppapapetrou76]

Related to #5

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Merging #34 (d1272b3) into master (f3eee5d) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #34      +/-   ##
==========================================
+ Coverage   97.36%   97.39%   +0.03%     
==========================================
  Files          12       12              
  Lines         531      538       +7     
==========================================
+ Hits          517      524       +7     
  Misses         14       14              

Impacted Files	Coverage Δ
assert/bool.go	100.00% <100.00%> (ø)
assert/error_messages.go	100.00% <100.00%> (ø)
assert/slice.go	100.00% <100.00%> (ø)

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