chore(package): update lodash to version 4.17.13

Closes #32

Author: greenkeeper[bot]

package.json

@@ -35,7 +35,7 @@
     "@types/lodash": "4.14.130",
     "@types/mocha": "5.2.6",
     "chai": "4.1.2",
-    "lodash": "4.17.11",
+    "lodash": "4.17.13",
     "mocha": "6.1.4"
   }
 }