fix(package): update snyk to version 1.159.0

Author: greenkeeper[bot]

package.json

@@ -68,7 +68,7 @@
     "request-promise-native": "1.0.7",
     "semver": "^6.0.0",
     "shelljs": "0.8.2",
-    "snyk": "1.156.0",
+    "snyk": "1.159.0",
     "source-map": "0.7.3",
     "triple-beam": "1.3.0",
     "uri-js": "4.2.2",