Changes
* Fix cost matrix bug on no link (38) yfukai
:package: Dependencies
* Bump nox from 2021.6.12 to 2021.10.1 in /.github/workflows (35) dependabot
* Bump flake8-bugbear from 21.9.1 to 21.9.2 (37) dependabot
* Bump sphinx from 4.1.2 to 4.2.0 in /docs (33) dependabot
* Bump virtualenv from 20.8.0 to 20.8.1 in /.github/workflows (34) dependabot
* Bump xdoctest from 0.15.8 to 0.15.9 (36) dependabot
* Bump poetry from 1.1.9 to 1.1.10 in /.github/workflows (32) dependabot
* Bump sphinx-rtd-theme from 0.5.2 to 1.0.0 in /docs (31) dependabot