chore(package): update prettier to version 2.0.4

Closes #105

Author: greenkeeper[bot]

package.json

@@ -48,7 +48,7 @@
     "eslint-plugin-prettier": "^2.0.1",
     "eslint-plugin-react": "^7.0.1",
     "jest": "^23.5.0",
-    "prettier": "^1.7.4",
+    "prettier": "^2.0.4",
     "raven-js": "^3.12.1",
     "react": "^16.0.0",
     "redux": "^3.6.0",