chore(package): update snazzy to version 6.0.0

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -34,7 +34,7 @@
     "istanbul": "^0.4.3",
     "json-stable-stringify": "^1.0.0",
     "mocha": "^3.0.0",
-    "snazzy": "^5.0.0",
+    "snazzy": "^6.0.0",
     "standard": "^8.0.0"
   }
 }