Upgrade prettier 1.16.3 -> 1.16.4

Author: ehmicky

package-lock.json

@@ -73,7 +73,7 @@
     "execa": "^1.0.0",
     "gulp": "^4.0.0",
     "plugin-error": "^1.0.1",
-    "prettier": "^1.16.3",
+    "prettier": "^1.16.4",
     "release-it": "^10.0.7"
   },
   "engines": {