Fix spelling of graphviz (issue-43)
Fix spelling of graphviz (issue-43)

isislovecruft/txtorcon,ghtdak/txtorcon,david415/txtorcon,david415/txtorcon,sammyshj/txtorcon,sammyshj/txtorcon,meejah/txtorcon,meejah/txtorcon,ghtdak/txtorcon,isislovecruft/txtorcon