chore(package): update prebuildify to version 2.8.0 (#107)

Author: greenkeeper[bot]

package.json

@@ -26,6 +26,6 @@
   },
   "devDependencies": {
     "mocha": "~5.2.0",
-    "prebuildify": "~2.7.0"
+    "prebuildify": "~2.8.0"
   }
 }