chore(package): update prettier to version 2.0.5

Closes #55

Author: greenkeeper[bot]

package.json

@@ -53,7 +53,7 @@
     "husky": "^1.1.2",
     "jest": "^22.0.0",
     "lint-staged": "^8.1.5",
-    "prettier": "^1.14.3"
+    "prettier": "^2.0.5"
   },
   "dependencies": {
     "babylon": "^6.18.0",