Merge pull request #6 from NodeOS/greenkeeper/prebuild-6.0.0

Update prebuild to the latest version 🚀

Author: piranna

package.json

@@ -32,6 +32,6 @@
     "prebuild-install": "2.0.0"
   },
   "devDependencies": {
-    "prebuild": "^5.0.0"
+    "prebuild": "^6.0.0"
   }
 }