fix: upgrade lodash from 4.17.4 to 4.17.21

Snyk has created this PR to upgrade lodash from 4.17.4 to 4.17.21.

See this package in npm:
https://www.npmjs.com/package/lodash

See this project in Snyk:
https://app.snyk.io/org/harry.kimpel/project/9dff5636-7f9c-4ab7-b35d-0f83ae4a1e5b?utm_source=github&utm_medium=referral&page=upgrade-pr

package.json

@@ -29,7 +29,7 @@
     "file-type": "^8.1.0",
     "humanize-ms": "1.0.1",
     "jquery": "^2.2.4",
-    "lodash": "4.17.4",
+    "lodash": "4.17.21",
     "marked": "0.3.5",
     "method-override": "latest",
     "moment": "2.15.1",