fix: functions/package.json, functions/package-lock.json & functions/…

….snyk to reduce vulnerabilities

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

functions/package.json

@@ -7,15 +7,19 @@
     "shell": "firebase experimental:functions:shell",
     "start": "npm run shell",
     "deploy": "firebase deploy --only functions",
-    "logs": "firebase functions:log"
+    "logs": "firebase functions:log",
+    "snyk-protect": "snyk protect",
+    "prepare": "npm run snyk-protect"
   },
   "dependencies": {
     "firebase-admin": "~5.8.1",
-    "firebase-functions": "^0.8.1"
+    "firebase-functions": "^0.8.1",
+    "snyk": "^1.316.1"
   },
   "devDependencies": {
     "eslint": "^4.12.0",
     "eslint-plugin-promise": "^3.6.0"
   },
-  "private": true
+  "private": true,
+  "snyk": true
 }