chore(package): update prettier to version 2.0.3

Closes #121

Author: greenkeeper[bot]

package.json

@@ -98,7 +98,7 @@
     "jest-environment-jsdom-global": "^1.0.3",
     "lint-staged": "^7.0.4",
     "lodash.isfunction": "^3.0.9",
-    "prettier": "^1.12.0",
+    "prettier": "^2.0.3",
     "react-test-renderer": "^16.3.1",
     "test-listen": "^1.0.2",
     "webpack-bundle-analyzer": "^3.0.0"