Fix typo

Author: jackdomleo7

README.md

@@ -178,7 +178,7 @@ _This project uses npm8 and Node >= 14 - however any project using this package
 5. Edit `src/**/*.scss` and run `npm run build` in the root of the project to regenerate the CSS found at `/checka11y.css` (DO NOT edit this file directly).
 6. To add error/warning styles and messages to your features, `@extend` one of the placeholders and `@include contentMessage()` from `src/_base.scss`.
 7. Add tests to your features in cypress folder (edit the element file or create a new one if needed)
-8. Run tests: `npm run cypress:open` or `npm run test` (headless)
+8. Run tests: `npm run test:ui` or `npm run test` (headless)
   - You can also run tests for a specific tag/attribute by doing `npm run test -- --spec cypress/integration/{file-to-test}`
 9. Add the feature to the [features.md](./features.md) & [codes.md](./codes.md) with a new error or warning code