chore(package): update prebuild to version 8.1.2

Closes #67

Author: greenkeeper[bot]

package.json

@@ -63,7 +63,7 @@
     "download-manager": "^0.1.3",
     "fs-extra": "^5.0.0",
     "nodeos-linux": "^4.15.10",
-    "prebuild": "^7.4.0"
+    "prebuild": "^8.1.2"
   },
   "main": "index.js",
   "repository": {