Fixing invalid graph-name syntax causing graphviz to error

[codecov-commenter]

Codecov Report

Merging #748 (45815cb) into master (34138f1) will not change coverage. The diff coverage is 0.00%.

@@            Coverage Diff            @@
##             master     #748   +/-   ##
=========================================
  Coverage     39.59%   39.59%           
  Complexity     2054     2054           
=========================================
  Files            75       75           
  Lines          7251     7251           
=========================================
  Hits           2871     2871           
  Misses         4380     4380           

Impacted Files	Coverage Δ
src/Graph/GraphOptions.php	0.00% <0.00%> (ø)

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[YOUR1]

Pinging my friendly Belgium neighbour @JeroenDeDauw!