[BUG] last-child:mb-0 doesn't raise a warning about being invalid

[sbdchd]

Describe the bug

<div className="last-child:mb-0 mb-2" />

Doesn't raise a warning about being invalid, the correct name is last:mb-0

To Reproduce

Use the following css and find no error is raised

<div className="last-child:mb-0 mb-2" />

Expected behavior
Raises error

Screenshots

Environment (please complete the following information):

• OS: [e.g. macOS, windows 10]
• Softwares + version used:
  • [e.g. VSCode 1.54.3]
  • [... Terminal 2.9.5, npm 6.14.5, node v14.5.0]

Additional context
Add any other context about the problem here.

eslint config file or live demo
By providing a link to a live demo, a demo video or a github repo fixing the issue will be easier.

[kachkaev]

This feature request is reflected in README.md → Upcoming rules as validate-modifiers.