Release 13.0.0

• Upgrade eslint-config-prettier 3.6.0 -> 4.0.0 (5168d2d)
• Disable arrow-body-style and prefer-arrow-callback (725fee2)
• Upgrade release-it 10.0.3 -> 10.0.4 (5d67e9a)
• Upgrade Node.js 11.7.0 -> 11.8.0 (700115a)
• Upgrade release-it 10.0.2 -> 10.0.3 (7a2fd72)
• Upgrade release-it 10.0.1 -> 10.0.2 (23ccdee)
• Upgrade eslint-plugin-import 2.14.0 -> 2.15.0 (04b1611)
• Upgrade eslint-plugin-unicorn 7.0.0 -> 7.1.0 (974b5a9)
• Upgrade prettier 1.16.0 -> 1.16.1 (768ed6d)