chore: 21.2.1 Release

[badabump-release-bot]

Fixes:

• [More precise version update #78] Precisely replace version in pyproject.toml or package.json files (fix: Precisely replace version in pyproject.toml or package.json files #79)
• [By default ignore related / fixes URLs on creating changes summary #76] By default ignore footer URLs in ChangeLog (fix: By default ignore footer URLs in ChangeLog #81)

Other:

• (deps) Bump actions/cache from 2.1.5 to 2.1.6 (build(deps): Bump actions/cache from 2.1.5 to 2.1.6 #74)
• (deps) Bump peter-evans/create-pull-request from 3.8.2 to 3.10.0 (build(deps): Bump peter-evans/create-pull-request from 3.8.2 to 3.10.0 #73)
• (deps-dev) Bump pytest-cov from 2.11.1 to 2.12.1 (build(deps-dev): Bump pytest-cov from 2.11.1 to 2.12.1 #75)
• (deps-dev) Bump time-machine from 2.1.0 to 2.3.1 (build(deps-dev): Bump time-machine from 2.1.0 to 2.3.1 #77)
• [Use tomli instead of toml #80] Use tomli instead of toml library (build: Use tomli instead of toml library #82)
• Bump pre-commit hooks (build: Bump pre-commit hooks #83)

[coveralls]

Coverage remained the same at 97.056% when pulling 28935ee on chore/release-v21.2.1 into 41961c5 on master.