Update dependency lodash to v4.17.15

Author: renovate-bot

package.json

@@ -12,7 +12,7 @@
     "url": "https://github.com/taskcluster/json-parameterization"
   },
   "dependencies": {
-    "lodash": "4.17.14",
+    "lodash": "4.17.15",
     "debug": "4.1.1",
     "notevil": "1.3.1"
   },