chore(package): update prebuild to version 6.0.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -55,7 +55,7 @@
     "prebuild-install": "2.1.0"
   },
   "devDependencies": {
-    "prebuild": "^5.0.3"
+    "prebuild": "^6.0.0"
   },
   "main": "index.js",
   "repository": {