fix: package.json & .snyk to reduce vulnerabilities

The following vulnerabilities are fixed with a Snyk patch:
- https://snyk.io/vuln/SNYK-JS-TREEKILL-536781

Author: snyk-bot

.snyk

@@ -1,5 +1,5 @@
 # Snyk (https://snyk.io) policy file, patches or ignores known vulnerabilities.
-version: v1.13.5
+version: v1.14.0
 ignore: {}
 # patches apply the minimum changes required to fix a vulnerability
 patch:
@@ -155,3 +155,12 @@ patch:
         patched: '2019-10-05T16:36:11.326Z'
     - '@node-red/nodes > https-proxy-agent':
         patched: '2019-10-05T16:36:11.326Z'
+  SNYK-JS-TREEKILL-536781:
+    - snyk > snyk-sbt-plugin > tree-kill:
+        patched: '2019-12-12T01:01:02.255Z'
+    - marpat > snyk > snyk-sbt-plugin > tree-kill:
+        patched: '2019-12-12T01:01:02.255Z'
+    - fms-api-client > snyk > snyk-sbt-plugin > tree-kill:
+        patched: '2019-12-12T01:01:02.255Z'
+    - fms-api-client > marpat > snyk > snyk-sbt-plugin > tree-kill:
+        patched: '2019-12-12T01:01:02.255Z'

package.json

@@ -71,7 +71,7 @@
     "fs-extra": "^8.0.1",
     "lodash": "^4.17.15",
     "marpat": "^2.1.2",
-    "snyk": "^1.235.1"
+    "snyk": "^1.258.2"
   },
   "devDependencies": {
     "chai": "^4.2.0",