chore(package): update prettier to version 2.0.4

Closes #29

Author: greenkeeper[bot]

package.json

@@ -74,7 +74,7 @@
     "postcss-import": "^12.0.1",
     "postcss-loader": "^3.0.0",
     "postcss-preset-env": "^6.7.0",
-    "prettier": "^1.19.1",
+    "prettier": "^2.0.4",
     "react": "^16.9.0",
     "react-dom": "^16.9.0",
     "react-test-renderer": "^16.12.0",