chore(package): update prettier to version 2.0.1

Closes #43

Author: greenkeeper[bot]

package.json

@@ -60,7 +60,7 @@
     "husky": "^0.14.3",
     "inquirer": "^4.0.1",
     "jest": "^22.0.4",
-    "prettier": "^1.9.2",
+    "prettier": "^2.0.1",
     "semantic-release": "^11.0.2"
   },
   "jest": {