chore(package): update prettier to version 2.0.1

Closes #69

Author: greenkeeper[bot]

package.json

@@ -65,7 +65,7 @@
     "eslint-plugin-node": "^8.0.1",
     "eslint-plugin-prettier": "^2.6.0",
     "loader.js": "^4.2.3",
-    "prettier": "^1.10.2"
+    "prettier": "^2.0.1"
   },
   "engines": {
     "node": "6.* || 8.* || >= 10.*"