Update README.md

Signed-off-by: Zoey <zoey@z0ey.de>

README.md

@@ -26,7 +26,7 @@ jobs:
  run: |
  git config user.name "GitHub"
  git config user.email "noreply@github.com"
- git add -A
+ git add src/input.css src/output.css
  git diff-index --quiet HEAD || git commit -sm "tailwindcss-update"
  git push
 ```