6.0.0

• Enabled unicorn/no-reduce and unicorn/no-useless-undefined
• Enabled jsx-a11y/no-onchange as part of jsx-a11y/recommended config
• Bump all peer dependencies:
  • eslint@^7.3.0
  • eslint-plugin-import@^2.21.2
  • eslint-plugin-jsx-a11y@^6.3.1
  • eslint-plugin-react@^7.20.0
  • eslint-plugin-react-hooks@^4.0.4
  • eslint-plugin-unicorn@^20.1.0