Update dependency marked to v4

Author: mend-for-github-com[bot]

package-lock.json

@@ -21,7 +21,7 @@
     "to": "0.2.6",
     "url": "0.11.0",
     "lodash": "4.17.15",
-    "marked": "0.3.19"
+    "marked": "4.0.10"
   },
   "devDependencies": {
     "mocha": "^7.0.1"