Updated lodash to 4.17.15 (to avoid prototype pollution)

Author: ddougan

package-lock.json

@@ -34,7 +34,7 @@
     "fs-extra": "^7.0.1",
     "handlebars": "^4.1.2",
     "highlight.js": "^9.13.1",
-    "lodash": "^4.17.11",
+    "lodash": "^4.17.15",
     "marked": "^0.7.0",
     "minimatch": "^3.0.0",
     "progress": "^2.0.3",