chore(package): update prettier to version 2.0.5

Closes #6

Author: greenkeeper[bot]

package.json

@@ -9,7 +9,7 @@
   "devDependencies": {
     "ava": "^0.25.0",
     "fixpack": "^2.3.1",
-    "prettier": "^1.13.4",
+    "prettier": "^2.0.5",
     "standard": "^12.0.1"
   },
   "homepage": "https://github.com/andrejewski/affection#readme",