Use identifier for detecting duplicate connections instead of the ResolvedDependency.

[vanniktech]

Fixes #26

[codecov]

Codecov Report

Merging #27 into master will not change coverage.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master      #27   +/-   ##
=========================================
  Coverage     87.08%   87.08%           
  Complexity       48       48           
=========================================
  Files            12       12           
  Lines           271      271           
  Branches         39       39           
=========================================
  Hits            236      236           
  Misses           30       30           
  Partials          5        5

Impacted Files	Coverage Δ	Complexity Δ
...niktech/dependency/graph/generator/DotGenerator.kt	100% <100%> (ø)	20 <0> (ø)	⬇️

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