[Snyk] Fix for 1 vulnerabilities (#1177)

* fix: package.json & .snyk to reduce vulnerabilities


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

* Update package.json

.snyk

@@ -6,3 +6,8 @@ patch:
   SNYK-JS-AXIOS-174505:
     - '@cityofzion/neon-js > axios':
         patched: '2019-08-02T07:32:26.723Z'
+  SNYK-JS-HTTPSPROXYAGENT-469131:
+    - snyk > proxy-agent > https-proxy-agent:
+        patched: '2019-10-04T01:45:35.994Z'
+    - snyk > proxy-agent > pac-proxy-agent > https-proxy-agent:
+        patched: '2019-10-04T01:45:35.994Z'

package.json

@@ -58,7 +58,7 @@
     "redux-saga": "0.16.2",
     "redux-thunk": "2.3.0",
     "sifter": "0.5.3",
-    "snyk": "1.230.0",
+    "snyk": "^1.230.5",
     "source-map-support": "0.5.13",
     "spunky": "1.3.1",
     "switch-tree": "0.2.2",