fix: .snyk & package.json to reduce vulnerabilities

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

package.json

@@ -7,7 +7,7 @@
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
     "snyk-protect": "snyk protect",
-    "prepublish": "npm run build && npm run snyk-protect",
+    "prepublish": "npm run build && yarn run snyk-protect",
     "build": "tsc -d"
   },
   "repository": {
@@ -35,10 +35,10 @@
   "dependencies": {
     "@types/node": "^12.12.7",
     "@types/request": "^2.48.3",
-    "snoowrap": "^1.20.1"
+    "snoowrap": "^1.20.1",
+    "snyk": "^1.316.1"
   },
   "devDependencies": {
-    "snyk": "^1.189.0",
     "typescript": "^3.7.2"
   },
   "homepage": "https://github.com/MayorMonty/Snoostorm#readme",