v0.6.8

NamedGraphs v0.6.8

Diff since v0.6.7

Merged pull requests:

• [pre-commit.ci] pre-commit autoupdate (#96) (@pre-commit-ci[bot])
• Edge coloring (#98) (@JoeyT1994)
• [pre-commit.ci] pre-commit autoupdate (#99) (@pre-commit-ci[bot])