chore(package): update prettier to version 2.0.3

Closes #44

Author: greenkeeper[bot]

package.json

@@ -63,7 +63,7 @@
     "husky": "^2.0.0",
     "jest": "^22.1.4",
     "lint-staged": "^9.0.0",
-    "prettier": "^1.10.2",
+    "prettier": "^2.0.3",
     "webpack": "^4.6.0",
     "webpack-cli": "^3.0.0",
     "prop-types": "^15.6.0",