build: remove css from list of files to format

- add new lines to fix the webpack tests outputs expectations

Author: Ffloriel

package.json

@@ -56,6 +56,6 @@
   },
   "lint-staged": {
     "*.ts": "eslint --cache --fix",
-    "*.{js,css,md}": "prettier --write"
+    "*.{js,md}": "prettier --write"
   }
 }

packages/purgecss-webpack-plugin/__tests__/cases/simple-with-exclusion/expected/bundle.css

@@ -12,3 +12,4 @@
 md\:w-2\/3 {
   color: red;
 }
+

packages/purgecss-webpack-plugin/__tests__/cases/simple-with-exclusion/expected/legacy.css

@@ -12,3 +12,4 @@
 .hello {
   color: red;
 }
+