chore(package): update prettier to version 2.0.1

Closes #45

Author: greenkeeper[bot]

package.json

@@ -41,7 +41,7 @@
     "husky": "^1.3.1",
     "jest": "^24.5.0",
     "lint-staged": "^8.1.5",
-    "prettier": "^1.16.4",
+    "prettier": "^2.0.1",
     "projectz": "^1.7.4",
     "semantic-release": "^15.13.3",
     "travis-deploy-once": "^5.0.11"