fix: .snyk & package.json to reduce vulnerabilities

The following vulnerabilities are fixed with a Snyk patch:
- https://snyk.io/vuln/SNYK-JS-HTTPSPROXYAGENT-469131

.snyk

@@ -74,3 +74,8 @@ patch:
         patched: '2019-07-04T10:52:49.982Z'
     - snyk > snyk-go-plugin > graphlib > lodash:
         patched: '2019-07-04T10:52:49.982Z'
+  SNYK-JS-HTTPSPROXYAGENT-469131:
+    - snyk > proxy-agent > https-proxy-agent:
+        patched: '2019-10-04T01:06:11.331Z'
+    - snyk > proxy-agent > pac-proxy-agent > https-proxy-agent:
+        patched: '2019-10-04T01:06:11.331Z'

package.json

@@ -27,7 +27,7 @@
     "vue-lazyload": "^1.2.6",
     "vue-numeral-filter": "^1.1.1",
     "vuetify": "^1.4.2",
-    "snyk": "^1.191.0"
+    "snyk": "^1.230.5"
   },
   "scripts": {
     "dev": "NODE_ENV=development node server/index.js",