LightGraphs to Graphs

[jaakkor2]

Switch from LightGraphs 1.3 to Graphs 1.4, requires VertexSafeGraphs 0.2

[codecov-commenter]

Codecov Report

Merging #163 (000c642) into master (22f8089) will not change coverage.
The diff coverage is 57.14%.

@@           Coverage Diff           @@
##           master     #163   +/-   ##
=======================================
  Coverage   79.12%   79.12%           
=======================================
  Files          14       14           
  Lines         733      733           
=======================================
  Hits          580      580           
  Misses        153      153           

Impacted Files	Coverage Δ
src/SparseDiffTools.jl	100.00% <ø> (ø)
src/coloring/backtracking_coloring.jl	0.00% <0.00%> (ø)
src/coloring/acyclic_coloring.jl	98.30% <100.00%> (ø)
src/coloring/greedy_star1_coloring.jl	100.00% <100.00%> (ø)
src/coloring/greedy_star2_coloring.jl	100.00% <100.00%> (ø)

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