chore(package): update prettier to version 2.0.1

Closes #196

Author: greenkeeper[bot]

package.json

@@ -60,7 +60,7 @@
     "eslint-plugin-prettier": "^3.1.2",
     "husky": "^4.2.0",
     "jest": "^25.1.0",
-    "prettier": "^1.19.1",
+    "prettier": "^2.0.1",
     "pretty": "^2.0.0",
     "supertest": "^4.0.2"
   },