chore(package): update prettier to version 2.0.2

Closes #22

Author: greenkeeper[bot]

package.json

@@ -46,7 +46,7 @@
     "grunt-documentation": "^1.2.3",
     "husky": "^3.0.5",
     "lint-staged": "^9.2.5",
-    "prettier": "^1.18.2",
+    "prettier": "^2.0.2",
     "standard-version": "^7.0.0"
   },
   "dependencies": {