chore(package): update prettier to version 2.0.3

Closes #259

Author: greenkeeper[bot]

package.json

@@ -76,7 +76,7 @@
     "faker": "^4.1.0",
     "mocha": "^3.2.0",
     "nw-builder": "^3.1.2",
-    "prettier": "^1.3.1",
+    "prettier": "^2.0.3",
     "supertest": "^3.0.0",
     "supertest-as-promised": "^4.0.2"
   }