Update snyk

Author: jwheare

.snyk

@@ -1,9 +1,17 @@
 # Snyk (https://snyk.io) policy file, patches or ignores known vulnerabilities.
-version: v1.12.0
+version: v1.13.3
 # ignores vulnerabilities until expiry date; change duration by modifying expiry date
 ignore:
+  SNYK-JS-LODASH-73638:
+    - getos > async > lodash:
+        reason: None given
+        expires: '2019-03-08T21:25:50.733Z'
+  SNYK-JS-LODASH-73639:
+    - getos > async > lodash:
+        reason: None given
+        expires: '2019-03-08T21:25:50.733Z'
   'npm:open:20180512':
     - open:
         reason: None given
-        expires: '2018-11-26T13:25:13.999Z'
+        expires: '2019-03-08T21:25:50.733Z'
 patch: {}