fix: package.json, package-lock.json & .snyk to reduce vulnerabilities

The following vulnerabilities are fixed with a Snyk patch:
- https://snyk.io/vuln/SNYK-JS-LODASH-567746

package.json

@@ -9,7 +9,7 @@
   "dependencies": {
     "restify": "^8.1.0",
     "vm2": "^3.6.11",
-    "snyk": "^1.290.1"
+    "snyk": "^1.316.1"
   },
   "devDependencies": {
     "eslint": "^4.19.1",