chore(package): update prettier to version 2.0.2

Closes #26

Author: greenkeeper[bot]

package.json

@@ -52,7 +52,7 @@
     "eslint-plugin-react": "^7.2.1",
     "jest": "^23.1.0",
     "mock-fs": "^4.5.0",
-    "prettier": "^1.13.4"
+    "prettier": "^2.0.2"
   },
   "dependencies": {
     "camelcase-keys": "^4.2.0",