Merge pull request #104 from zhw2590582/dependabot/npm_and_yarn/rollup-plugin-postcss-4.0.0

Bump rollup-plugin-postcss from 3.1.8 to 4.0.0

package.json

@@ -60,7 +60,7 @@
         "rollup-plugin-eslint": "^7.0.0",
         "rollup-plugin-json": "^4.0.0",
         "rollup-plugin-node-resolve": "^5.2.0",
-        "rollup-plugin-postcss": "^3.1.8",
+        "rollup-plugin-postcss": "^4.0.0",
         "rollup-plugin-replace": "^2.2.0",
         "rollup-plugin-size-snapshot": "^0.12.0",
         "rollup-plugin-svgo": "^1.1.0",