chore(package): update prettier to version 2.0.1

Closes #19

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
     "jest": "^25.1.0",
     "jest-cli": "^25.1.0",
     "lint-staged": "^10.0.7",
-    "prettier": "^1.19.1",
+    "prettier": "^2.0.1",
     "prettier-package-json": "^2.1.3"
   },
   "keywords": [