chore(package): update ngx-markdown to version 6.2.0

Author: greenkeeper[bot]

demo/package.json

@@ -33,7 +33,7 @@
     "bootstrap": "^4.1.3",
     "core-js": "^2.5.4",
     "font-awesome": "^4.7.0",
-    "ngx-markdown": "^6.1.0",
+    "ngx-markdown": "^6.2.0",
     "rxjs": "^6.2.2",
     "zone.js": "^0.8.26"
   },