chore(package): update prettier to version 2.0.3

Closes #12

Author: greenkeeper[bot]

package.json

@@ -50,7 +50,7 @@
     "jest": "^24.1.0",
     "lint-staged": "^10.0.3",
     "microbundle": "^0.11.0",
-    "prettier": "^1.10.2"
+    "prettier": "^2.0.3"
   },
   "husky": {
     "hooks": {