chore(package): update prettier to version 2.0.5

Closes #168

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
     "husky": "3.0.9",
     "jest": "24.9.0",
     "lint-staged": "10.0.9",
-    "prettier": "1.19.0",
+    "prettier": "2.0.5",
     "pug": "2.0.4",
     "standard-version": "7.1.0",
     "typescript": "3.6.4",