v6.12.0

📚 PR:

• Update ci.yml
• [Docs] document that .child() call triggers level-change event. (#1014)
• ci: add nodejs v16 to test matrix (#1018)
• build(deps): bump actions/checkout from 2 to 2.3.4 (#1024)
• ci: remove redundant conditional; ignore doc updates (#1026)
• build(deps-dev): bump eslint-plugin-promise from 4.3.1 to 5.1.0 (#1029)
• build(deps): bump fastify/github-action-merge-dependabot (#1030)
• build(deps): bump actions/upload-artifact from 2.2.3 to 2.2.4 (#1044)
• build(deps): bump fastify/github-action-merge-dependabot (#1033)
• Better describe base options in docs (#1046)
• build(deps): bump coverallsapp/github-action from 1.1.2 to 1.1.3 (#1055)
• Handle complex object cases (#1061)
• Improved LTS documentation (#1060)
• feat: child redact option (#1059)