Handle recursive depenencies correctly.

[vanniktech]

Fixes #44

[codecov]

Codecov Report

Merging #45 into master will decrease coverage by 0.04%.
The diff coverage is 85.71%.

@@             Coverage Diff              @@
##             master      #45      +/-   ##
============================================
- Coverage     86.83%   86.78%   -0.05%     
  Complexity       52       52              
============================================
  Files            12       12              
  Lines           281      280       -1     
  Branches         42       42              
============================================
- Hits            244      243       -1     
  Misses           30       30              
  Partials          7        7

Impacted Files	Coverage Δ	Complexity Δ
...niktech/dependency/graph/generator/DotGenerator.kt	97.26% <85.71%> (-0.04%)	24 <5> (ø)

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