Fixing security issues (mic159#25)

Author: mic159

example/package-lock.json

@@ -11,7 +11,7 @@
     "babel-preset-es2015": "^6.9.0",
     "babel-preset-react": "^6.5.0",
     "jquery": "^3.4.1",
-    "marked": "^0.6.2",
+    "marked": "^0.8.0",
     "react": "^16.4",
     "react-dom": "^16.4",
     "react-render-service": "^1.3.0",