chore(package): update prettier to version 2.0.3

Closes #133

Author: greenkeeper[bot]

package.json

@@ -49,7 +49,7 @@
     "husky": "^1.3.0",
     "jest": "^23.6.0",
     "lint-staged": "^8.1.0",
-    "prettier": "^1.15.3",
+    "prettier": "^2.0.3",
     "react": "^16.6.3",
     "semantic-release": "^15.0.0",
     "travis-deploy-once": "^5.0.1"