Update rules.go

[3zero2]

Added rule for https://arstechnica.com

Do you follow the guidelines?

• [ x] I have tested my changes
• [ x] There are no breaking changes
• [ x] I really tested my changes and there is no regression
• [ x] Ideally, my commit messages follow the Conventional Commits specification
• [x ] I read this document: https://miniflux.app/faq.html#pull-request

[3zero2]

Replaced tab with spaces.