Update lodash version

Author: vamsee

package.json

@@ -15,7 +15,7 @@
   },
   "dependencies": {
     "async": "2.6.1",
-    "lodash": "4.17.19"
+    "lodash": "4.17.20"
   },
   "devDependencies": {
     "babel-eslint": "7.2.3",