chore(package): update prettier to version 2.0.3

Closes #12

Author: greenkeeper[bot]

package.json

@@ -29,7 +29,7 @@
     "eslint-plugin-prettier": "^3.1.1",
     "eslint-plugin-react": "^7.16.0",
     "html-webpack-plugin": "^3.2.0",
-    "prettier": "^1.18.2",
+    "prettier": "^2.0.3",
     "react-hot-loader": "^4.12.15",
     "webpack": "^4.41.2",
     "webpack-bundle-analyzer": "^3.6.0",