Update dependency acorn to v8.0.4

Author: renovate-bot

package-lock.json

@@ -11,7 +11,7 @@
     "@types/react-router-dom": "5.1.5",
     "@types/react-router-hash-link": "1.2.1",
     "@types/webpack": "4.41.22",
-    "acorn": "8.0.3",
+    "acorn": "8.0.4",
     "classnames": "2.2.6",
     "concurrently": "5.3.0",
     "copyfiles": "2.4.0",